Here is the full list of all 52 Unsouled achievements.
There’s a first time for everything.
Defeat Niug.
Defeat Niug on the Master Soul difficulty, only using counters.
Defeat Niug on the upper floor, on the Master Soul difficulty.
Defeat Irus
On the Master Soul difficulty, deliver a killing blow to Irus using projectile counter followed by a chain counter without getting burned.
Defeat Irus at a special location on the Master Soul difficulty.
Defeat Lad.
Defeat Lad on the Master Soul difficulty, destroying every pillar and finishing the fight with a Just Guard counter.
Defeat Lad at a special location on the Master Soul difficulty.
Defeat Gnar.
Defeat Gnar on the Master Soul difficulty, without using counters or Just Guards.
Defeat Gnar at a special location on the Master Soul difficulty,
Defeat Ammu.
Defeat Kamas.
Defeat Kamas on the Master Soul difficulty without getting damaged by Just Guards or counters, and successfully land 8 or more counters, before delivering the killing blow with a counter.
Defeat Luyh.
Defeat Lyuh without using Active Soul and maintaining at least 10 Chains and a 10-hit combo.
Defeat Ammu (trueform).
Defeat Ammu (trueform) on the Master Soul difficulty with Thousand Demons while avoid getting frozen.
Knock 200 enemies off a ledge.
Do 100 consecutive Chains.
Successfully do a 100-hit combo in the Abyss.
Successfully perform 10 Chain counters on the Master Soul difficulty.
Successfully perform 20 Chain counters on the Master Soul difficulty.
Perform 300 Just Guards on the Master Soul difficulty.
Perform 500 Counterattacks on the Master Soul difficulty.
Kill 4,000 enemies.
Complete all battle system and counterattack missions in the Abyss.
Complete all of the Abyss combo missions.
Absorb all Passive Souls.
Absorb all Active Souls.
Fully upgrade all skills.
Fully upgrade all stats.
Obtain a Little Ghost Soul.
Eliminate every type of enemy using a counter.
Find all viewpoints.
In Act 1, drown at least 2 enemies in the waterway.
In Act 2, successfully weave through the rolling boulders.
In Act 2, knock off at least 2 enemies into the left ritual well.
While riding on a boat in Act 3, use Soul Focus to rescue a Soul.
In Act 3, complete the absorption puzzle without hitting or getting damaged by enemies.
Absorb the Twisted Lady’s Soul in Act 3.
Break all the barriers in the back garden in Act 4.
Open the sealed door in Act 4.
Play the secret melody on the chimes in Act 4.
Find the secret location, The Tomb of Everything.
Execute the Unsouled with the twisted soul in Act 5.
Find all secret passageways in Act 5.
Successfully restore your soul in Alpha Laboratory.
Successfully restore your body in Alpha Laboratory.
Defeat and clear all bosses and stages on Master Soul difficulty.