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