Full list of all 53 Gigapocalypse achievements.
The base game contains 48 achievements, and there is 1 DLC pack containing 5 achievements.
Finish the Metro Dome level
Acquire 40 Power Up(s)
Reach maximum level of any pet
Equip pets in all slots of any Giga
Reach level 30 with any Giga
Finish the Lost Island level
Defeat boss 6 times
Unlock the last skill with any Giga
Finish the Knight Age level
Reach the maximum level of one mutation
Get 5 meat on a single run
Take 200000 damage in total
Buy 20 pieces of furniture
Clean Giga poop 10 times
Feed Giga 10 times
Take 125000 damage in total
Destroy 500 buildings
Finish the Wild West level
Defeat boss 3 times
Acquire 20 Power Up(s)
Take 50000 damage in total
Unlock a new skin
Reach maximum level with any skill
Slay 1000 humans
Acquire 10 Power Up(s)
Reach level 10 with any Giga
Finish the Suburbs level
Take 10000 damage in total
Acquire 5 Power Up(s)
Buy your first piece of furniture
Equip a pet
Reach level 2 with any Giga
Feed, clean and play with your Giga for the first time
Meet the dancing clown 10 times
Destroy the cult building 5 times
Meet the alley gator 10 times
Meet the vigilante 7 times
Zap hawkmen 5 times
Destroy the totem 10 times
Reach the maximum level with all Giga
Finish the Eternal City level
Unlock all skins for any Giga
Take 1000000 damage in total
Defeat boss 12 times
Slay 5000 humans
Slay 15000 humans
Destroy 1500 buildings
Destroy 3000 buildings
Zap 10 Duck Knights
Solve 5 chess puzzles
Light 10 fire beacons
Destroy 10 meteors
Defeat Octopy 5 times