I just won the get a lob on trophy playing an online multiplayer non-ranked game on full wormage using just the concrete donkey?! How did this happen is it a glitch?

Which game are you talking about?

That trophy is only in the PSN version.

"Win any PlayStation®Network game using just the Grenade."

The donkey is not a grenade, so the achievement seems glitched.

Oddly my opponent only used grenades though (I think, I could be wrong)