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