Have a single turret kill 30 aliens in a level
Get 4 Challenge medals
Get all the Challenge medals
Kill 10 aliens
Complete the tutorial
Clean out the competition
Put on a hat
Complete the desert biome
Open 10 spawn crates
Complete all levels with hardcore mode enabled
Get 16 Challenge medals
Fall down bottomless pits 20 times
Be disassembled by an alien 100 times
Collect 2500 scraps
Kill 100 aliens
Open 50 spawn crates
Complete a level on your own
Scrap the crown of the Slime King
Get 8 Challenge medals
Defeat the final boss
Collect 50 scraps
Kill 1000 aliens
Collect 1000 scraps
Find all the duckies
Construct a giant garbage cube
Get 32 Challenge medals
Complete all 4 challenges on a level
Collect 200 scraps
Kill 500 aliens
Complete a level with 4 players
Chuck a stunned alien into a bottomless pit
Open 100 spawn crates
Complete a level with a friend