Here is the full list of all 25 Diablo IV achievements.
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.
Kill 50 enemies in Werebear form and 50 enemies in Werewolf form as a Druid.
Kill the most challenging Echo of Lilith.
Get 5 PvP kills.
Complete a Sacred and Ancestral Nightmare Dungeon.
Acquire 10 Caches of Chaos from the Tree of Whispers.
Upgrade a piece of Armor, Jewelry, and a Weapon.
Imprint 10 items at the Occultist with an Aspect from the Codex of Power.
Kill 666 Bandits, Cultists, or Knights.
Kill 666 Snakes or Spiders.
Kill 50 enemies in melee range and 50 enemies out of melee range as a Rogue.
Reach Level 100 with any character.
Kill 666 Demons, Fallen, or Goatmen.
Craft any Elixir and any Incense.
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.
Reach Level 50 with any character.
Reach Level 50 with a Hardcore character.
Upgrade your Healing Potion to max tier.
Kill any World Boss.