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