Here is the full list of all 34 Moonscars achievements.
Cast the very first clayborn mould.
Slay the first doppelganger of Irma.
Fall under Moonhunger for the first time.
Alleviate Moonhunger for the first time.
Discover all Special Weapons.
Learn a witchery of greatest power.
Maximize regular weapon damage.
Maximize Ichor Gauge.
Maximize Health Gauge.
Equip gemstones into all available slots.
Unlock all achievements.
Slay Traitor Chokran of the Pristines.
Slay Gniewko, the Royal Infant.
Slay Sweet Wanda of the Pristines.
Slay Cruel Lajos of the Pristines.
Slay Red Irma and cleave the Moon.
Complete the story of Grey Irma.
Slay the friendly doppelganger.
Receive help from the spared doppelganger.
Help Etalag survive to the finale.
Meet Yarema's mould.
Receive all gifts from little Adelinka.
Bring Her anger upon hermitess Karina.
Bring to old Horpyna clayborn child.
Listen to all stories of the mad clayborn.
Face Queen Yadwiga after her enthronement.
Bid Ion the last farewell.
Throw 25 foes onto spikes.
Kill 5 foes in less than 3 seconds.
Spend 10 Ichoral Glands.
Stun 50 foes.
Kill 25 foes with status effects.
Parry 50 attacks.
Die 10 times (and do not fall into despair).