Here is the full list of all 50 Darksiders II achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Complete Tears of the Mountain
Unlock Reaper Form
Complete Fire of the Mountain
Collect Redemption
First use of Fast Travel
Defeat the Crowfather
Defeat the Guardian
Defeat Archon
Defeat Samael
Defeat The Wailing Host
Defeat Absalom
Complete the game on any difficulty setting
Complete the game on NORMAL
Complete the game on APOCALYPTIC
Collect Deathgrip
Collect the Voidwalker
Collect the Phasewalker
Collect the Soul Splitter
Collect the Interdiction Stone
Complete 3 different high dives in the Foundry
Complete GnoMAD
Complete To Move a Mountain
Complete Heart of the Mountain
Complete Tree of Life
Complete The Lord of Bones
Complete The Toll of Kings
Defeat Basileus
Complete The Book of the Dead
Complete City of the Dead
Open The Well Of Souls
Complete The Rod of Arafel
Unlock the final skill in either skill tree
Equip elite items to all slots
Complete Stains of Heresy
Complete The Mad Queen
Complete Lord of the Black Stone
Complete all Secondary Quests
Defeat Wicked K
Complete The Crucible
Defeat the four creatures named by Thane
Open all Death Tombs
Complete Lost Relics
Defeat the Soul Arbiter
Death Reaches Level 30
Level Up Your 1st Possessed Weapon
Gift An Item To A Friend
Complete Sticks and Stones
Unlock All Combat Moves & Upgrades
Unlock Everything
Your First Respec