Here is the full list of all 12 Madballs in… Babo: Invasion achievements worth 200 gamerscore.
Unlock your first item
Host a 4-player co-op game
Finish the campaign
Crush 100 enemies using Magmor's Colossus ability
A fierce kill using every title weapon
Find all secrets in the Babo Campaign
Win 5 games of Team Skirmish
Win a 6+ player CTF game with the most points on your team
Win an 8+ player Invasion game
Unlock the Officer ranks
Unlock the Hero ranks
Achieve the top Hero Rank