After you defeat an opponent in the arena, presss Select + Start when you see the "Victory" message. This will add your fallen opponent's emblem to your list.
For every mission you where you earn an 'A' or 'S' rank, you will receive a special bonus part.
|MRL-MM/001||Reach AC rank D|
|MWGG-HNRL-100||Reach AC rank C|
|KAW-SAMURAI2||Reach AC rank B|
|MAM-MX/MDD||Reach AC rank A|
|MBT-NI/GULL||Reach AC rank S|
|CWI-DD-30||Defeat E-21 at the Arena|
|RGI-KDA01||Defeat E-15 at the Arena|
|KWG-NHZL30||Defeat E-8 at the Arena|
|CWR-M70||Defeat D-7 at the Arena|
|CWM-BM60-1||Defeat C-7 at the Arena|
|MWG-SRFE/8||Defeat B-4 at the Arena|
|MCL-SS/RAY||Defeat A-3 at the Arena|
|MWG-MG/FINGER||Defeat A-1 at the Arena|
|CWM-HA40-8||Defeat rank 1 in Extra Arena|
|MWG-HGB/108||Rank S in all missions|
|KGP-ZXV1||Complete all missions|
|CCL-02-EI||Complete 10 missions from Crest|
|MCM-MI/008||Complete 13 missions from Mirage|
|KEEP-ELIX||Complete 7 missions from Kisaragi|
|Op-Intensify (All Abilities)||Obtain 99% completion of the game|
Thanks to Revolution reader zakk prins!