This Trophy will pop when you win the final match of the Campaign. The Campaign is essentially a lengthy tutorial. There are 15 matches in the Campaign and during the progression you should pick up several other Trophies including but not limited to:
One down! Who's next?
Unassailable Defense
Expert Strategist
Cheerleaders
The Grim Reaper (Potentially)
Not so fast! (Potentially)
Beat it! (Potentially)