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