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