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