Here is the full list of all 75 Project Warlock II achievements.
Achieve at least 30% of headshot percentage on any level
Kill 1000 monsters with headshots.
Find all secrets in E1M1.
Find the Nightmare Reaper Character
Kill 500 monsters with headshots.
Send 500 ghouls back to the grave.
Escape your castle.
Find the Square in the corner.
Find your first Bestiary entry.
Kill 100 monsters with headshots.
Kill 100 monsters.
Find your first secret.
Fight through the old village.
Travel through the ancient forest.
Reach the ruin complex.
Fight through the ruins.
Defeat the Necromancer
Complete the first episode on the easiest difficulty.
Complete the first episode on the standard difficulty.
Complete the first episode on the hard difficulty.
Complete the first episode on the hardcore difficulty.
Send 1000 ghouls back to the grave.
Find all secrets on all levels.
Kill 500 Succubuses.
Kill 1000 Succubuses.
Kill 500 Boneys.
Kill 1000 Boneys.
Kill 500 Bugdemons.
Kill 1000 Bugdemons.
Kill a Knight with a Claymore.
Kill 500 Knights.
Kill 1000 Knights.
Kill 500 Pigdemons.
Kill 1000 Pigdemons.
Kill 500 Shamblers.
Kill 1000 Shamblers.
Find all secrets in E1M4.
Find all secrets in E1M3.
Find all secrets in E1M5.
Find all secrets in E1M11.
Find all secrets in E1M12.
Kill 10 000 monsters with headshots
Find the Duskdude
Kill 500 Cacobots.
Kill 1000 Cacobots.
Kill 500 Necromages.
Kill 1000 Necromages.
Kill 500 Spiderlings.
Kill 1000 Spiderlings.
Kill 500 Spideys.
Kill 1000 Spideys
Kill 500 Weavers.
Kill 1000 Weavers.
Find the Prodeus guy.
Find the Amid Evil character.
Find Caroline.
Find the Hedongirl.
Kill the Necromant 100 times.