Here is the full list of all 38 Styx: Shards of Darkness trophies - there are 18 bronze, 16 silver, 3 gold and 1 platinum.
Unlock all trophies
Unlock all skills
Unlock Gold level for all Insignias in all missions
Finish Mission 9
Finish Mission 8
Finish Mission 7
Teleport 20 times into a clone (with the skill)
Finish Mission 6
Finish Mission 5
Finish Mission 4
Give of yourself to the worship of Lyssril...
Unlock your first ultimate skill
Finish Mission 3
Drink 25 vials of amber
Create 50 clones
Remain invisible for a total of one minute
Be saved by a Life-saving Clone
Push 10 enemies over the edge
Being invisible in a chest and not being caught by an enemy on a search
Finish Mission 2
Kill 5 guards with acid traps
Finish Mission 1
Pickpocket 10 enemies
Dissolve 10 enemies (vial of acid)
Craft 30 items
Get out alive from 10 red alerts
Complete a level without using an amber power
Unlock Gold level for all Insignias in a mission
Finish a mission with the gold Insignia of Mercy
Finish a mission with the gold Insignia of Swiftness
Finish a level without taking damage
Finish a mission with the gold Insignia of the Thief
Finish a mission with the gold Insignia of the Shadow
Finish the introduction
Kill all the enemies in a zone
Having hidden 50 times in a duct or a hideout
Kill an enemy in his sleep
Collect 50 raw materials