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