You need 25k, 50k, 75k and 100k in classic mode
*Don't quit, make sure to die after you reach 100K so you unlock Arena mode*
Just watch the bar at the top.
It's your health and slowmo meter
LT is slowmo. Only use it when needed
and it's better to tap.
Killing enemies gives health.
Be aggressive and kill them fast.
Hold RT to shoot.
100% Achievement Walkthrough: