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