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