Here is the full list of all 92 Shadow Warrior achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Kill 100 Mother demons before they explode
Kill 50 burning enemies
Buy all weapon upgrades
Kill 50 enemies using a demon head
Kill 50 enemies with a demon heart
Learn all skills
Obtain all power upgrades
Kill 50 enemies ensnared in water trap
Pin 50 enemies to walls with crossbow bolts
Kill 100 enemies with explosive environmental objects
Kill 50 crawling demons
Kill 75 enemies using sticky bombs
Burn 100 enemies to death
Complete the game on difficulty Normal
Complete the game on difficulty Hard
Complete the game on difficulty Insane
Complete the game on difficulty Casual
Defeat Xing on difficulty Normal
Defeat Xing on difficulty Hard
Defeat Xing on difficulty Insane
Defeat Xing on difficulty Casual
Kill 15 enemies within 20 seconds on difficulty Casual
Kill 15 enemies within 20 seconds on difficulty Normal
Kill 15 enemies within 20 seconds on difficulty Hard
Kill 15 enemies within 20 seconds on difficulty Insane
Kill 2500 enemies
Kill 150 enemies using environmental damage only
Kill 50 enraged demons
Defeat Mezu on difficulty Normal
Defeat Mezu on difficulty Hard
Defeat Mezu on difficulty Insane
Defeat Mezu on difficulty Casual
Kill a Berserker on difficulty Casual
Kill a berserker on difficulty Normal
Kill a berserker on difficulty Hard
Kill a berserker on difficulty Insane
Find 25 secrets
Destroy 1000 destructible items
Kill 50 enemies with a headshot
Kill 3 enemies with one shot on difficulty Casual
Kill 3 enemies with one shot on difficulty Normal
Kill 3 enemies with one shot on difficulty Hard
Kill 3 enemies with one shot on difficulty Insane
Kill 10 enemies within 15 seconds on difficulty Normal
Kill 10 enemies within 15 seconds on difficulty Hard
Kill 10 enemies within 15 seconds on difficulty Insane
Kill 10 enemies within 15 seconds on difficulty Casual
Obtain 200 massacre bonuses
Kill 20 enemies using environmental damage only
Defeat Gozu on difficulty Casual
Defeat Gozu on difficulty Normal
Defeat Gozu on difficulty Hard
Defeat Gozu on difficulty Insane
Buy 5 weapon upgrades
Kill 100 enemies using katana special attacks
Learn 10 skills
Kill a Shaman on difficulty Casual
Kill a Shaman on difficulty Normal
Kill a Shaman on difficulty Hard
Kill a Shaman on difficulty Insane
Obtain 5 power upgrades
Kill 500 enemies
Kill 5 enemies within 10 seconds on difficulty Casual
Kill 5 enemies within 10 seconds on difficulty Normal
Kill 5 enemies within 10 seconds on difficulty Hard
Kill 5 enemies within 10 seconds on difficulty Insane
Dismember 500 enemies
Kill a Warlord on difficulty Casual
Kill a Warlord on difficulty Normal
Kill a Warlord on difficulty Hard
Kill a Warlord on difficulty Insane
Find 5 secrets
Destroy 250 destructible items
Decapitate 50 enemies
Kill 100 enemies
Destroy 50 destructible items
Kill 1000 enemies using environmental damage only
Find all the secrets in the game
Kill 6 enemies with one shot on difficulty Casual
Kill 10 enemies with one shot on difficulty Casual
Kill 50 stunned enemies
Electrocute to death 100 enemies
Complete the game on difficulty Heroic
Kill 10 evil rabbits
Unlock all achievements
Kill 6 enemies with one shot on difficulty Normal
Kill 6 enemies with one shot on difficulty Hard
Kill 6 enemies with one shot on difficulty Insane
Kill 10 enemies with one shot on difficulty Normal
Kill 10 enemies with one shot on difficulty Hard
Kill 10 enemies with one shot on difficulty Insane
Find all fortune cookies