Full list of all 29 Takotan achievements worth 4,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements in the base game on Xbox One.
The base game contains 14 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 15 achievements worth 3,000 Gamerscore.
Collect 20 cakes
Collect 30 gashapon capsules
Collect 250 diamonds
Collect 12 green diamonds
Collect 12 yellow diamonds
Collect 12 red diamonds
Collect 12 purple diamonds
Collect 12 violet diamonds
Kill 50 enemies
Kill 500 enemies
Kill 1000 enemies
Defeat King Krunky
Defeat Sticky Treat
Defeat Mechanoid
Collect 24 green diamonds
Collect 24 yellow diamonds
Collect 24 red diamonds
Collect 24 purple diamonds
Collect 24 violet diamonds
Collect 30 green diamonds
Collect 30 yellow diamonds
Collect 30 red diamonds
Collect 30 purple diamonds
Collect 30 violet diamonds
Collect 20 diamonds
Collect 40 diamonds
Collect 60 diamonds
Collect 80 diamonds
Collect 100 diamonds