Monster Outbreak

40 achievements

Ultra Rare×24

Very Rare×9

Rare×3

Uncommon×2

Common×2

About Monster Outbreak's achievements

Monster Outbreak has 40 Steam achievements, 24 of them ultra-rare — unlocked by under 5% of players. The rarest is "Giant Assassin", 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 "Giant Assassin"

🗺️ Community guides & walkthroughs

Community Ratings

No ratings yet

Difficulty—

Easy → Brutal

Enjoyment—

Meh → Loved it

Grindiness—

No grind → Huge grind

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All Monster Outbreak achievements

40 achievements

Giant Assassin

Kill 500 devourer giants

Ultra Rare0.5%

Veteran

Reach wave 100 on any map

Ultra Rare0.5%

Cannon Lover

Kill 1,000 monsters using cannons

Ultra Rare0.6%

Bird Hunter

Kill 500 dimensional harpies

Ultra Rare0.6%

Master of Fire

Kill 1,000 monsters using fire towers

Ultra Rare0.7%

Old School Crossbow Killer

Kill 1,000 monsters using crossbows

Ultra Rare0.7%

Fort Knox

Kill 100,000 monsters with structures

Ultra Rare0.8%

Invader Defender

Kill 1,000 invaders

Ultra Rare0.8%

Visual Impairment

Kill 500 beholders

Ultra Rare0.8%

Arachnophobia

Kill 500 scorpions

Ultra Rare0.8%

Battle Axe Slayer

Kill 200 monsters with an axe

Ultra Rare1.0%

Not Easily Fooled

Kill the Trickster

Ultra Rare1.0%

Survivalist

Reach wave 50 on any map

Ultra Rare1.0%

Exterminator

Kill 100,000 monsters

Ultra Rare1.1%

Hammer Slammer

Kill 200 monsters with a hammer

Ultra Rare1.2%

Bow Sniper

Kill 500 monsters with a bow

Ultra Rare2.0%

Fashionista

Unlock every character skin

Ultra Rare2.0%

Spin Class

Kill 1,000 monsters using wooden spinners

Ultra Rare2.1%

Animal Lover

Unlock every pet skin

Ultra Rare2.1%

Master Builder

Unlock every structure

Ultra Rare2.3%

Cartographer

Unlock all the maps

Ultra Rare2.4%

Volcanologist

Unlock all lava maps

Ultra Rare2.5%

Miner

Collect 2,000 rocks

Ultra Rare3.0%

Horror Fan

Unlock all undead maps

Ultra Rare4.5%

Base Builder

Kill 1,000 monsters with structures

Very Rare6.0%

Rock Slayer

Kill the Golem

Very Rare6.1%

Flower Enthusiast

Collect 10 ghost flowers

Very Rare7.3%

Rock Collector

Collect 10 magic rocks

Very Rare7.4%

Experienced Swordsman

Kill 500 monsters with your sword

Very Rare8.2%

Necromancer

Kill the Undead King

Very Rare9.1%

Lumberjack

Collect 2,000 logs

Very Rare10.6%

Hunter

Kill 1,000 monsters

Very Rare11.1%

Rookie

Reach wave 20 on any map

Very Rare15.0%

Eye Snatcher

Collect a beholder eye

Rare19.1%

Yeeted

Collect an electric stone

Rare23.7%

Sleeted

Collect an ice stone

Rare28.0%

Monster Trapper

Kill 100 monsters with structures

Uncommon30.6%

Dethroned

Kill the Slime King

Uncommon48.1%

Beginner Slayer

Kill 100 monsters

Common57.8%

Heated

Collect a fire stone

Common84.7%