All I have left on Seed of Destruction is the three minigames, Illiterate, and the 20+ combo. I got the Looking for a Challenge one after 15 minutes, and you only have to play the last level on hard to get the Seed of Destruction medal.
For the grenade juggling combo, I've been having a really hard time getting a grenade up in the air. Any advice on positioning/movement strategy to get started?
Deploy the... it's a yellow button... it's usually flashing... it makes the engines go... whoosh!