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