Armored Core Nexus

Hidden Parts 
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CR-194DD2 Episode 1 Mission 3- The targets you're defending can't be destroyed.
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CR-WR93RL Episode 2 Mission 1- Submarine must survive with greater than 60% AP

*CR-B83TP Episode 2 Mission 2
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WH03M-FINGER Episode 3 Mission 2- No more than 2 bombs can fall.

KANGI Episode 3 Mission 3- All gun batteries must survive
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YWLO3LB-TAROS, *ANANDA Episode 4 Mission 2- Both are acquired in same mission, Taro's is a completion bonus.
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*WH06PL-ORC Episode 5 Mission 1

WB28R-SIREN4 Episode 5 Mission 2- The target you are defending must survive with 80% AP or greater.
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YH06-LADYB Episode 6 Mission 2- Destroy enemy AC within 1 minute and 30 seconds.

FUNI Episode 6 Mission 3- Finish mission in under 30 seconds.
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CR-YHN70S2 Episode 7 Mission 1- Destroy enemy AC within 30 seconds.

*RENGA Episode 7 Mission 2
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*103RN-CORAL Episode 8 Mission 1

YA10-LORIS Episode 8 Mission 2- Mission completion bonus.
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CR-LH79L Episode 9 Mission 3- The targets you're defending can't be destroyed.
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*JIREN Episode 10 Mission 1
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WH04HL-KRSW Episode 11 Mission 2- Destroy more enemies by 3. (credit goes to sputi.)

*KARURA Episode 11 Mission 3
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CR-LRJ84M Episode 12 Mission 1- Complete with 5 or fewer planes destroyed.

MIROKU Episode 12 Mission 2- Finsh mission in under 2 minutes
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NIOH Episode 13 Mission 1

YH08-MANTIS , YWH07-DRAGON Episode 13 Mission 2- Destroy enemy AC with 45 seconds for Dragon, and Mantis is a completion bonus. You acquire both parts in this mission.
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WL-MOONLIGHT Episode 14 Mission 1- Finish Mission in under 1 minute.

YLH11-VIXEN Episode 14 Mission 2- Mission completion bonus
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BYAKUE Episode 15 Mission 1- Destroy target within 30 seconds

CR-YH85SR, YC07-CRONUS Episode 15 Mission 2- Destroy enemy AC within 30 seconds, CRONUS is a completion bonus.