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