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