Full list of all 46 Gauntlet Slayer Edition achievements. It takes around 40-50 hours to unlock all of the achievements in the base game on Windows.
The base game contains 43 achievements, and there is 1 DLC pack containing 3 achievements.
Ghostwalk through 500 enemies - Necromancer
Summon 1200 Undead Minions - Necromancer
Take 10000 Cumulative Damage as the Necromancer