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