BZB: In Space - Top Ten Trophy in Burn Zombie Burn!
BZB: In Space - Top Ten
Beat ten of your friends in any leaderboard on either the Engine Room or Mothership Bridge.
How to unlock BZB: In Space - Top Ten
If you're trying to do this without boosting, you'll have to have a better score than 10 of your friends on a single leaderboard for Engine Room or Mothership Bridge. This includes all 4 Arcade modes for each map. Once you see your score reflected on the leaderboard (they don't update immediately), the trophy will pop.
If you want to boost this, please checking the boosting thread:
Some users have set up dummy accounts with low scores that you can easily "beat."