To get this achievement you must:
1) Unlock rockubot
2) Play with him
1) You unlock Rockubot when you beat ALL FREE GIGS on drums, regardless of the difficulty.
It doesn't have to be after times square as other solutions suggest; this will be true however if you do all gigs in order since times square is the last free gig.
This means you do NOT REQUIRE:
- USA - Tool
2) To play with him, you can look for an online match of any type after unlocking him, and you will be able to choose him, which will be free; or if you don't want to go online, you can buy him for $15,000 and play with him locally.