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