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