Full list of all 45 Diablo IV achievements. It takes around 100-120 hours to unlock all of the achievements in the base game on Windows.
The base game contains 25 achievements, and there are 2 DLC packs containing 20 achievements.
Complete the Vessel of Hatred campaign.
Complete the Rise of the Khazra Dark Citadel.
Explore all of Nahantu.
Collect 10,000 Aberrant Cinders in Nahantu Helltides.
Reach level 10 with all Mercenaries.
Kill 666 Dregs, Lacuni, or Hollows.
Reach Paragon 300 with any character.
Kill 500 enemies with Ultimate Skills as a Spiritborn.
Defeat 1000 Elites on Torment IV.
Complete 25 runs of the Kurast Undercity.
Kill 1000 Elites in Torment XII.
Explore all of Skovos.
Kill 1000 Bosses/Elites in the Echoing Hatred.
Kill 100 enemies with your Demonology skills.
Complete the Lord of Hatred campaign.
Collect all the fish in one region.
Kill 666 Golems, Merfolk, or Morlu.
Activate a Charm Set's 5-piece bonus.
Equip a piece of Transfigured gear in every slot.
Complete 10 War Plans.