Operation Octo

91 achievements

Ultra Rare×16

Very Rare×28

Rare×15

Uncommon×17

Common×15

About Operation Octo's achievements

Operation Octo has 91 Steam achievements, 16 of them ultra-rare — unlocked by under 5% of players. The rarest is "Lab Anniversary", earned by just 0.5% of players. Below is the complete achievement list with global rarity and a full achievement difficulty breakdown.

Rarest achievement

0.5%

of players earned "Lab Anniversary"

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Difficulty—

Easy → Brutal

Enjoyment—

Meh → Loved it

Grindiness—

No grind → Huge grind

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All Operation Octo achievements

91 achievements

Lab Anniversary

Play the game on its anniversary of release

Ultra Rare0.5%

Wolverine

Have Odin take damage equivalent to 140% of his total hp within 10 seconds, without dying

Ultra Rare1.0%

???

Hidden achievement — tap Reveal secrets to spoil

Ultra Rare1.2%

Frosty Proliferation

Have 20 Frosty Everywhere Eels on the field at the same time

Ultra Rare1.5%

Archeologist

Complete Level 3-5 “Graveyard Shift” without getting stunned or taking any damage

Ultra Rare1.7%

Tea-bone Party

Have a Leaky Dropship drop all three of its crews into lakes

Ultra Rare2.4%

Ping-Pong For Boomers

Have a Boomerang deflected between a Bumper Fish and a Racquet Skeleton for 3 rounds

Ultra Rare2.5%

Bountiful Harvest

Complete Level 2-5 “Clam Farm” in under 4 minutes

Ultra Rare2.5%

Institute Fundraiser

Earn a total of 10,000 coins

Ultra Rare2.7%

Fearless Turtles

Finish a level with at least 5 Sniper Turtles on the field, without having scared any of them

Ultra Rare2.9%

Wealth by Glamour

Earn a total of 100 rubies

Ultra Rare3.0%

Photophobia

Survive a level in Twilight Zone without getting light from Planktons or Lantern Fish

Ultra Rare3.1%

World Peace

Fill up all gravestones inside any one Graveyard Region

Ultra Rare3.4%

Garden Rush Hero

Win a level by only manually placing Everywhere Eel ONCE, without ever placing any other combat (blue) turrets

Ultra Rare3.7%

Benefactor of a Dolphin

Spend over 5000 coins at Dr. Finn’s shop

Ultra Rare3.8%

Carcenization

Win a level where at least 5 skeletons are trapped by Crab Traps at the end

Ultra Rare3.9%

???

Hidden achievement — tap Reveal secrets to spoil

Very Rare5.3%

Shove a Bezoar

Have 4 status inflictions on Dr. Odin at the same time

Very Rare5.5%

Permanent Paralysis

Keep a skeleton stunned for 25 seconds using only Zappy Jellies

Very Rare5.8%

Caffeine

Have a sleeping Hermit waken up by a Potion vapor

Very Rare5.8%

Money to the Ceiling

Have 300 uncollected Pearls on the field at the same time

Very Rare5.8%

???

Hidden achievement — tap Reveal secrets to spoil

Very Rare6.4%

Idle Farm

Reach 10 cycles inside a Graveyard Simulation

Very Rare6.4%

???

Hidden achievement — tap Reveal secrets to spoil

Very Rare6.5%

Feeding Frenzy

Complete 20 Sandy Shallows Treat Bucket quests

Very Rare6.6%

Action Star

Beat a regular level without using combat (blue) turrets

Very Rare7.1%

???

Hidden achievement — tap Reveal secrets to spoil

Very Rare7.1%

Eggsecution

Have Hollow Snail egg mines kill 5 skeletons during a single level (outside of Graveyard)

Very Rare7.6%

Octo Fiasco

Somehow manage to fail Level 1-1 in tutorial mode

Very Rare8.1%

Aye Yai Yai, Captain

Prevent Captain Phantom from dealing damage to anything for an entire level

Very Rare8.3%

Doppelgänger

Have 2 pink imitated turrets (from Imitation Crabs) on the field at the same time (outside of Graveyard or Custom Levels; Everywhere Eel doesn't count)

Very Rare8.5%

???

Hidden achievement — tap Reveal secrets to spoil

Very Rare9.2%

Sleepy Bunch

Wake up 5 Hermit Holsters within 5 seconds

Very Rare9.3%

Blade Spam

Land all four of an Axe-o-lotl’s slashes onto the same skeleton

Very Rare9.3%

Photomania

Have 15 Lantern Fish on the field at the same time

Very Rare9.9%

Slippery Floor

Have 70 Ice Mucus tiles on the field at the same time

Very Rare9.9%

???

Hidden achievement — tap Reveal secrets to spoil

Very Rare10.1%

Avid Recycler

Place Hammer Shark 10 times during a single level

Very Rare10.7%

Love Me, Love My Dog

Have 7 Watchdogs on the field at the same time

Very Rare11.2%

Dolphlock’s Irregulars

Have 3 Spiky Urchins on the field at the same time (outside of Graveyard or Custom Levels)

Very Rare11.7%

Save a Tree

Revive a knocked-out Pearl Tree before it dies permanently

Very Rare11.9%

Acid Reflux

Complete 20 Toxic Wastelands Treat Bucket quests

Very Rare12.7%

Cycle Deck

Have 3 non-mimic Pearl Trees on the field simultaneously

Very Rare13.4%

Good Haul

Make a profit of 15 Pearls using a single Frogfish

Very Rare14.5%

Late-Night Snack

Complete 20 Twilight Zone Treat Bucket quests

Rare15.5%

Safely Defused

Have Dr. Odin trigger a Bomb Barrel without taking any damage himself

Rare16.5%

Neverending Distraction

Keep a skeleton taunted by the same Red Herring for 10 seconds, without stunning the skeleton

Rare16.7%

Walk the Plank

Permanently lose a turret by having it sink into a lake

Rare18.2%

Geometry

During Level 1-5 “Bumper Maze”, have cannonballs bounce off of 4 different Bumper Fish within 2 seconds, while Odin stands still and takes no damage

Rare18.5%

Salty Sea Dog

Evade a Watchdog for 20 seconds while he chases after you

Rare20.1%

Augustus the Great

Die from poison damage over time

Rare20.1%

Dallons Adrift

Defeat Captain Dallons for the first time

Rare21.8%

You Had One Job!

Have a Bumperfish knocked out by a deflectable projectile

Rare22.3%

Octopus Regeneration

Survive on exactly 1 HP then fully recover before a level’s end

Rare22.6%

Quick Reflex or Dumb Luck

Sink a Racquet Skeleton into a pool using Zappy Jelly while it is dashing

Rare23.0%

Cheating Death

Wake up or recycle a knocked-out turret as a Reaper Skeleton lifts his scythe to destroy it

Rare25.5%

10,001 Ways that Won’t Work

Complete Level 3-10 “Leviathan Trench”

Rare26.9%

Penny Pincher

Pick up 200 successive coins without having left any coin to disappear

Rare26.9%

Responsible Parenting

Have 4 Pearl Trees die in a single level

Rare27.8%

Productive Workout

Acquire 300 pearls from Mussel Beests during a single level (outside of Graveyard)

Uncommon30.2%

Break Time

Interrupt a Diver Skeleton’s drill after it has reached max charge

Uncommon31.0%

Friendly Freeze

Get slowed down by your own Frosty turret

Uncommon31.4%

Blob on the Job

Blow up 7 skeletons with a single Blobfish

Uncommon32.2%

Untouchable

Complete any level without taking any damage

Uncommon32.4%

Bone Picker

Complete Level 3-5 “Graveyard Shift”

Uncommon32.5%

Say No to Vandalism

Destroy a spinning spray can using Zappy Jelly or Blobfish

Uncommon32.6%

???

Hidden achievement — tap Reveal secrets to spoil

Uncommon34.8%

Sharp Shot

Land Lionfish‘s critical hit 5 times

Uncommon35.9%

A Dime a Dozen

Place down 80 turrets during a single level

Uncommon37.5%

???

Hidden achievement — tap Reveal secrets to spoil

Uncommon37.7%

Breach Repaired

Defeat Dr. Kraxen for the first time

Uncommon39.0%

Sufficient Funds

Fill up your entire Pearl Flask during a regular level

Uncommon40.0%

Seal the Deal

Complete Level 2-10 “Sergeant's Plateau”

Uncommon44.8%

Live Deliciously

Fail a level for the first time

Uncommon47.1%

Davy Jones’ Smelter

Sink 5 Skeletons into lakes

Uncommon47.9%

Ping-Pong

Have a projectile deflected between a Bumper Fish and a Racquet Skeleton for 3 rounds

Uncommon48.4%

???

Hidden achievement — tap Reveal secrets to spoil

Common50.8%

Shellfish Husbandry

Complete Level 2-5 “Clam Farm”

Common51.3%

Chirpy Alarm

Revive 5 knocked-out turrets using Bubble Parrots

Common53.7%

Clam Abandonment

Have the same Clam knocked out 3 times in a single level

Common54.9%

???

Hidden achievement — tap Reveal secrets to spoil

Common56.4%

Appetizer

Feed a total of 10 fish to Dr. Finn

Common59.8%

Avid Tinker

Discover 5 upgraded turret forms

Common63.6%

Flag Down

Defeat Crâne Exalté for the first time

Common63.8%

???

Hidden achievement — tap Reveal secrets to spoil

Common64.8%

The Beautiful Glow

Pick up a Ruby

Common64.9%

Aragonite Profiteer

Collect 130 pearls within 10 seconds

Common66.6%

Delivery Received

Complete Level 1-10 “Free Shipment”

Common72.5%

Bumpy Ride

Complete Level 1-5 “Bumper Maze”

Common83.5%

???

Hidden achievement — tap Reveal secrets to spoil

Common96.0%

The Odin Hypothesis

Complete Level 1-1 “Initial Test”

Common97.0%