Here is the full list of all 20 Pacific Rim: The Video Game achievements worth 400 gamerscore.
Complete the Tutorial
Complete Normal Mission 1
Complete Survival Mission 1
Complete 4 Normal Missions
Complete 4 Survival Missions
Complete 8 Normal Missions
Complete 8 Survival Missions
Complete all Normal Missions.
Complete all Survival Missions.
Get a gold medal for all Normal Missions.
Get a gold medal for all Survival Missions.
Purchase and save a Jaeger.
Join an Xbox LIVE Team Battle team and win 1 RANKED MATCH.
Join Guardian Corp. in Xbox LIVE Team Battle and reach Team Lv15.
Join Guardian Corp. in Xbox LIVE Team Battle and reach Team Lv30.
Join Talonfist in Xbox LIVE Team Battle and reach Team Lv15.
Join Talonfist in Xbox LIVE Team Battle and reach Team Lv30.
Join Militia Brotherhood in Xbox LIVE Team Battle and reach Team Lv15.
Join Militia Brotherhood in Xbox LIVE Team Battle and reach Team Lv30.
Reach Lv30 for all Xbox LIVE Team Battle teams.