Here is the full list of all 45 Blackguards achievements.
Tutorial finished
Finished Chapter 1
Finished Chapter 2
Finished Chapter 3
Finished Chapter 4
Finished Chapter 5
Finished all arena fights in Mengbilla
Aurelia chose you
Aurelia turned against you
Took all bribe opportunities with Zurbaran
Met all Trainers
All heroes of the party have a ranged combat skill of 10 or higher
Learned all spells available for player characters in the game
One of your characters has an attribut score of 20
One of your characters has a score of 15 or higher in all attributes
One of your characters has a talent with a score of 18 or higher
One of your characters has a score of 10 or higher in all talents
One of your characters has 21000 Adventure Points
One of your characters has a weapon talent score of 18
One of your characters has a weapon talent score of 10 in all weapon talents
One of your characters has a score of 10 in all spells
5.000 Vitality Points healed during all battles, with all characters
Deal 5.000 damage during all battles with all characters
Deal 5.000 damage using spells
Drink 4 potions with one character during one battle
Use 4 poisons with one character during one battle
Win a battle with one hero standing and a maximum of 5 Vitality Points
Start a battle without ammunition for your bows and crossbows
Use 50 interactive objects
Swap through all three weapon sets in one battle with one character
Walk an ideal circle with one character during combat by orbiting 7 hexes
Hurt one of your heroes
Kill 20 insects with fire damage
Knock 10 enemies off ledges
Defeat 50 opponents with interactive objects
All characters wear a complete set of gear
Carry 100 Greatpounds of inventory with you
Buy 25 flasks of weapon poison
Earn 1000 gold pieces
Visit every location
Ask for the healer's services 50 times
Buy alchemical supplies 50 times
Visit every vendor
Sleep at the Inn 50 times
One of your characters has a score of 18 in one spell