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