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