Here is the full list of all 25 Diablo IV achievements.
Reach Level 100 with any character.
Upgrade your Healing Potion to max tier.
Kill the most challenging Echo of Lilith.
Complete a Sacred and Ancestral Nightmare Dungeon.
Acquire 10 Caches of Chaos from the Tree of Whispers.
Explore all of Estuar.
Summon 100 Skeleton Mages or Warriors as a Necromancer.
Collect 1000 Aberrant Cinder in Helltide zones.
Kill 50 enemies while Berserking as a Barbarian.
Kill 50 enemies in Werebear form and 50 enemies in Werewolf form as a Druid.
Kill 100 enemies with Fire, Frost, or Lightning damage as a Sorcerer.
Get 5 PvP kills.
Craft any Elixir and any Incense.
Reach Level 50 with a Hardcore character.
Imprint 10 items at the Occultist with an Aspect from the Codex of Power.
Reach Level 50 with any character.
Kill 666 Snakes or Spiders.
Kill any World Boss.
Complete the campaign.
Kill 666 Bandits, Cultists, or Knights.
Upgrade a piece of Armor, Jewelry, and a Weapon.
Kill 666 Ghosts, Skeletons, or Zombies.
Kill 666 Drowned, Vampires, or Werewolves.
Kill 666 Demons, Fallen, or Goatmen.
Kill 50 enemies in melee range and 50 enemies out of melee range as a Rogue.