Shadow Tactics: Blades of the Shogun

This can only be earned during the tenth mission.

Throughout the mission you'll be able to reclaim parts of your equipment, either by eliminating certain enemies or simply picking them up close to where Aiko is being held.
It's pretty hard to miss anything, as each piece of equipment is indicated with a symbol. The exception being Kuma, but I'm not entirely sure whether he's actually needed for this trophy.

Here's a list of all the equipment you need to reclaim:

• Kuma
  Can be recalled while still imprisoned with Takuma. (Might not be required.)
• Yuki's tanto, Rat's Tooth
  Picked up from the samurai patrolling near the prison cells at the beginning.
• 4x Matchlock pistols
  All pistols are located on two tables near Aiko.
• Yuki's little trap
  Picked up from a guard standing in the area slightly below Aiko.
• Aiko's disguise
  Hanging from a clothesline close to the gate you need to pass to reach Mugen.
• Yuki's bird's voice
  Picked up from a guard early on in the second part of the mission, after reuniting with Mugen.
• Hayato's shuriken
  Picked up from a guard during the second part of the mission, located in the area on the right after crossing the bridge.
• Hayato's ninjat?
  Picked up from a guard during the second part of the mission, located in the area on the right after crossing the bridge.