Here is the full list of all 21 War of the Roses achievements.
Obtain all support efficiency prizes in the game.
2001 crossbow headshots.
Reach rank 60.
Reach rank 50.
Reach rank 40.
Reach rank 30.
Reach rank 25.
Finish 2nd in a ranked match.
Finish as the best player in a ranked match.
Kill 10 enemies in a row.
Reach rank 20.
Keep the war civil and serve an english breakfast to your favoured foe.
Gain 10000 XP in one round.
Reach rank 13.
Finish 3rd in a ranked match.
Reach rank 7.
Hit an enemy with a ranged weapon from ~160 feet.
Reach rank 1.
Obtain all Mounted prizes.
Obtain all weapon efficiency prizes.
Obtain one of each prize in the game.