Here is the full list of all 33 D-Corp achievements.
Kill 10 aliens
Kill 100 aliens
Kill 500 aliens
Kill 1000 aliens
Collect 50 scraps
Collect 200 scraps
Collect 1000 scraps
Collect 2500 scraps
Collect 10 stars
Collect 50 stars
Collect 100 stars
Collect 500 stars
Complete the tutorial
Defeat the final boss
Complete the desert biome
Open 10 spawn crates
Open 50 spawn crates
Open 100 spawn crates
Have a single turret kill 30 aliens in a level
Collect all the stars
Complete a level with 4 stars
Complete a level with 4 players
Complete a level with a friend
Complete a level on your own
Chuck a stunned alien into a bottomless pit
Put on a hat
Fall down a bottomless pit
Be disassembled by an alien 100 times
Find all the duckies
Complete all levels with hardcore mode enabled
Scrap the crown of the Slime King
Clean out the competition
Construct a giant garbage cube