Halo: Reach Challenge Initiative - Ride the Wave
Ride the Wave
Complete 150 Waves in Firefight Matchmaking.
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This doesn't take to long. Because there are like 15 waves in Arcadefight (only if you finish the match), and it only takes 20 minutes, I recommend doing that. This is because it takes 7 min. to do a solo firefight and only 5 waves in that frame of time. When you have 4 people, it'll go by WAYYY faster.