Here is the full list of all 21 NeverEnd achievements.
Complete the game with the stick
Beat the game
Kill the final Boss
Finish the second quest
Collect all hats
Buy all items
Buy a Bow and a Rod in one run
Kill the dummy
Kill 50 enemies with the bow
Finish the first quest
Walk through 100 rooms in one run
Get 20c in one run without the Rod
Kill every mini boss in one run
Find one elemental sword
Walk into a room with 6 Zomborgs
Kill your first mini boss
Konami code
Buy your first item
Die in the first 10 seconds
Kill your first enemy
First death