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