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