Here is the full list of all 36 Crashlands achievements.
Defeat 100 Epic Creatures.
Craft 500 walls.
Finally Defeat Hewgodooko.
Build THE GONG.
Create 15 taxidermied creatures.
Defeat IHO.
Wear a full set of excellent (or better).
Defeat EMG.
Craft 100 walls.
Craft 5 legendary items.
Defeat the Poteti.
Set foot in the Tundra.
Craft 1,000 floors.
Defeat Hewgodooko in the Bawg.
Defeat Toomah.
Defeat the Ynnix.
Defeat Jessica.
Defeat 100 Powerful Creatures.
Defeat Baary.
Defeat 1000 Creatures.
Defeat the Baconweed Fairy.
Set foot in the Bawg.
Defeat Hewgodooko in the Savannah.
Craft 100 floors.
Defeat Blockstock.
Defeat 100 creatures.
Craft a legendary item.
Craft 10,000 floors.
Beat the game in Challenge Mode
Beat the game on Insane Mode
Beat the first boss in hardcore mode
Get to Bawg in hardcore mode
Get to Tundra hardcore mode
Beat the hardcore mode
Beat the hardcore mode in challenge difficulty
Beat the hardcore mode in insane difficulty