Here is the full list of all 24 Sunken achievements.
Finish Spin 1.
Kill 100 elites.
Kill 5000 monsters.
Kill 100 champions.
Kill 50 elites.
Kill 2000 monsters.
Kill 30 elites.
Kill 50 champions.
Kill 1000 monsters.
Kill 30 champions.
Kill 500 monsters.
Kill 10 elites.
Kill 10 champions.
Finish Spin 2.
Finish Spin 3.
Finish Spin 4.
Finish Spin 5.
Finish Spin 6.
Finish Spin 7.
Finish Spin 8.
Finish Spin 9.
Finish Spin 10.
Achieve Redemption
Unlock All Abilities.