Here is the full list of all 24 The Light Brigade achievements.
Try to fire your weapon without first reloading it.
Kill an enemy sniper from far away.
Spend 1,000 gold at a store.
Defeat the second boss.
Hold onto 1,000 coins at once during a run.
Kill an enemy bomber using a grenade.
Land 250 gunshots. (accumulated)
Reload 100 times. (accumulated)
After death, find your ghost and pray to it.
Defeat the first boss.
Rescue an ally Light Brigade soldier out on a run.
Travel 1,000 meters. (accumulated)
Use an enemy's dropped weapon to kill another enemy.
Pray to the Mother.
Die and be revived for the first time.
Finish your first run, start to finish.
Land 250 headshots. (accumulated)
Never miss a shot during a fully completed run.
Every single shot during a fully completed run is a headshot.
Use the wishing well.
Kill an enemy priest using magic.
Defeat the Father.
Have a hypnotized enemy kill another enemy.
Cock an ally Light Brigade soldier's rifle.