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