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.
Corrupt seven Abilities.
Defeat Nyarlathotep.
Corrupt your first Ability.
Find all Perks.
Defeat Nyarlathotep & The Shining Trapezohedron.
Collect 500,000 Shards.
Destroy seven Elder Shards.
Defeat all Minibosses.
Defeat Legion & Salvation.
Equip three Perks simultaneously.
Unlock all Abilities.
Defeat Dominion.
Defeat Hysteria.
Destroy your first Elder Shard.
Collect 10,000 Shards.
Equip your first Perk.
Defeat your first Miniboss.
Survive your first horde.
Unlock your first Ability.