Here is the full list of all 43 Darksiders achievements. It takes around 30-35 hours to unlock all of the achievements on Windows.
Defeat the game on NORMAL
Complete the game on EASY
Defeat The Destroyer
Forge the Armageddon Blade
Collect the Abyssal Armor Set
Collect the Mask of Shadows
Defeat Straga
Collect the Voidwalker
Collect all the Wrath Powers
Defeat Silitha
Collect the Abyssal Chain
Search 150 chests
Shed 3000 gallons of demon blood
Defeat The Stygian
Obtain Ruin
Gain the Chronomancer Ability
Collect Mercy
Defeat The Griever
Meet Ulthane
Collect the Chaos Form Ability
Defeat Tiamat
Kill 666 Demons
Collect the Crossblade
Kill 160 enemies while on the angelic beast
Collect the Earthcaller
Meet Vulgrim
Free Samael from his prison
Defeat the game on APOCALYPTIC
Defeating more Angels than Ulthane
Kill 10 enemies with one Blade Geyser wrath attack
Collect the Tremor Gauntlet
Collect The Scythe
Collect the maximum amount of lifestones
Collect the maximum amount of wrath cores
Gain the Shadowflight Ability
Collect All 27 Artifacts
Ride for 100 miles
Kill 150 Demons from horseback
Max out all weapons and unlock all combat moves
Kill 5 duskbats without touching the ground
Kill 150 enemies with items from the environment
Unlocked Everything
Take out a helicopter with a car during the apocalypse