Here is the full list of all 25 Crush Your Enemies achievements.
Crush 20,000 Generian fighters.
Impale 123 of your enemies' heads.
Collect 500 pints of beer.
Complete Fuzgut The Destroyer's campaign.
Kill 40 enemies at once with your Spiky Mine.
Use the Dummy Barbarian 10 times.
Crush 10,000 Generian fighters.
Take over all the farms and survive until the enemy has no food left.
Crush an enemy group using Warriors and Archers with Wizards to support them both.
Use the Shroom Moonshine 10 times.
Collect 200 pints of beer.
Complete Brog The Barbarian's campaign.
Impale 50 of your enemies' heads.
Lose a battle.
Collect 50 pints of beer.
Crush 1,000 Generian fighters.
Impale 20 of your enemies' heads.
Complete 3 objectives in 4 different battles in a row.
Collect your first beer.
Win the first battle in Generia.
Impale 3 of your enemies' heads.
Win a multiplayer battle.
Win 10 multiplayer battles.
Play 100 multiplayer battles.
Lose multiplayer battles in 5 different locations.