wallhack - allows powered up player to see enemy locations through walls for some time
aimbot - pickup adds x lockons
silencer - player & player weapons are totally silenced for some time
noclip - player can fly & walk through walls for some time
pentagram - it should come back, ql can become a summation of the history of quake
scan - show enemy health & armor, weapons & ammo for some time
shield - shots ricochet off player for some time
star - increased speed, invulnerability, and damage touched players, but can't fire weapon
nodecay - health & armor gathered over 100 does not decay, reset upon death
timer - sets alarm for 5 seconds before each next major powerup spawn


some achievements:
speed limit awards, such as reaching 500, 600, 700, 800, 900, 1000 ups
frag run awards, such as reaching 10, 20, 30, 40, 50, etc. without a death

allow players to reset their own stats