Defense Grid: The Awakening
Out of Bullets - Beat all 5 'Out of Bullets' challenge modes without using Gun or Cannon towers

Toki Tori
Get a Tan - Stand in all sun beams

AaAaAA!!! - A Reckless Disregard for Gravity
Air. Wind. Sun. Pain. I Am All of This, and Your Mom Makes a Fine Pasta Dinner - Complete the Summer Sun level from the main menu with full points

Team Fortress 2
Escape the Heat - Jump into a pool of refreshing water while on fire

HOARD
Fireth of July - Cause 20 groups of fireworks to go off in a Hoard Mode level