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