Here is the full list of all 20 Sundered achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Defeat Humanity.
Find all Perks.
Corrupt seven Abilities.
Defeat Nyarlathotep.
Corrupt your first Ability.
Defeat Nyarlathotep & The Shining Trapezohedron.
Destroy seven Elder Shards.
Collect 500,000 Shards.
Defeat Legion & Salvation.
Defeat all Minibosses.
Unlock all Abilities.
Equip three Perks simultaneously.
Destroy your first Elder Shard.
Defeat Hysteria.
Defeat Dominion.
Collect 10,000 Shards.
Defeat your first Miniboss.
Equip your first Perk.
Survive your first horde.
Unlock your first Ability.