Here is the full list of all 43 Fight High achievements.
Play at least one game with the Zerker class.
Play at least one game with the Heavy class.
Play at least one game with the Pyro class.
Play at least one game with the Scout class.
Play at least one game with the Sniper class.
Play at least one game with the Assault class.
Play as the Zerker class 100 times.
Play as the Heavy class 100 times.
Play as the Pyro class 100 times.
Play as the Scout class 100 times.
Play as the Sniper class 100 times.
Play as the Assault class 100 times.
Play all classes 100 times.
Purchase the shotgun.
Purchase the LMG.
Purchase the Flame Thrower.
Purchase the SMG.
Purchase the Sniper Rifle.
Purchase the Assault Rifle.
Fully upgrade the shotgun.
Fully upgrade the LMG.
Fully upgrade the Flame Thrower.
Fully upgrade the SMG.
Fully upgrade the Sniper.
Fully upgrade the Assault Rifle.
Purchase and fully upgrade all weapons.
Killed 100 Squires.
Killed 1000 Squires.
Killed 5000 Squires.
Killed 100 Knights.
Killed 1000 Knights.
Killed 5000 Knights.
Killed 100 Archers
Killed 1000 Archers.
Killed 2500 Archers.
Killed 100 Mages.
Killed 1000 Mages.
Killed 2500 Mages.
Killed 100 Summoners.
Killed 500 Summoners.
Killed 100 Dragons.
Killed 500 Dragons.
Killed 1000 Dragons.