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