Both achievments at each level should be equal at the difficulty to achieve it, at some classes you can reach the first achievment in 10 rounds and the second one requires atleast 200. Edit: Some insane achievments, the info under each class works only if you survive each round wich you most likely won't. Medic #1: Heal 2,000,000 #2: Survive 2000 rounds -Heal 1000HP per round Berserker #1: Deal 10,000,000 damage with melees #2: Survive 2000 rounds -5000 melee damage per round Commando #1: Get 500,000 headshots #2: Survive 2000 rounds -250 headshots per round Engineer #1: Deal 10,000,000 damage with Pulse weapons #2: Survive 2000 rounds -5000 pulse damage per round Support #1: Nail 150,000 props #2: Survive 2000 rounds -75 nailed props per round