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