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