Here is the full list of all 25 Diablo IV achievements.
Get 5 PvP kills.
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 666 Demons, Fallen, or Goatmen.
Kill 666 Ghosts, Skeletons, or Zombies.
Kill 50 enemies while Berserking as a Barbarian.
Kill 666 Drowned, Vampires, or Werewolves.
Summon 100 Skeleton Mages or Warriors as a Necromancer.
Craft any Elixir and any Incense.
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.
Kill 100 enemies with Fire, Frost, or Lightning damage as a Sorcerer.
Upgrade a piece of Armor, Jewelry, and a Weapon.
Acquire 10 Caches of Chaos from the Tree of Whispers.
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.
Reach Level 100 with any character.
Complete a Sacred and Ancestral Nightmare Dungeon.