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