Age of Chivalry

Start a game on aoc_siege and join the blue team. You can start the trebuchet (giant wooden catapult thing) right from the start by interacting with it. Once it's ready to fire, interact with a lever on the left side (facing from the back) to fire it.

Start a game on aoc_darkforest, join the red team, then use "sv_cheats 1; noclip; sv_cheats 0" to quickly get to the house that the wagon is in. Disable noclip by inputting the command again and push the wagon. The objective "push the wagon" should appear on your minimap, if you're having trouble finding it.

You need to select a specific class to earn it , true that this achievement is not as "easy" as it seems