Here is the full list of all 52 Confrontation achievements.
Finish the solo campaign
Kill 20 Biopsists
Play Taelyn for 4h
Play Haeth for 5h
Reach level 40 with a unit
Finish Chapter 3
Let Zelia fall to the ground in agony 25 times
Play Lanwys for 6h
Kill 10 Ritualists
Suffer 100 stuns
Use Meteor 50 times with Zelia
Kill 10 Sibyls
Play Zelia for 6h
Earn 3,000,000 XP points
Kill 10 Pack leaders
Play Fera for 5h
Reach level 30 with a unit
Suffer 50 fears
Play Darius for 5h
Kill 100 Wolfen
Finish Chapter 2
Kill 15 Initiates
Reach level 20 with a unit
Kill 100 Orcs
Use Divine Favor 50 times with Lanwys
Spend 10 Armor points
Finish Chapter 1
Spend 10 Weapon points
Kill 20 Dasyatis
Make 50 quick saves
Spend 10 Attribute points
Reach level 10 with a unit
Kill a Mecasyatis
Kill 100 Scorpions
Launch the game credits
Kill 20 Belisarius
Kill 15 Totem bearers
Kill 15 Fanatics
Use Holy Prayer 50 times with Darius
Use Wave of Fervour 50 times with Lothaire
Use Fireball 50 times with Nekhys
Use Exorcism 50 times with Nemrod
Use Shadow's kin 50 times with Fera
Let your units fall to the ground in agony 150 times
Open a character data sheet 100 times
Make 50 quick loads
Play Lothaire for 5h
Play Melian for 5h
Play Nekhys for 6h
Play Nemrod for 5h
Play Dalon for 6h
Play Caan for 5h