Mouse Trap - Assassin's Creed: The Ezio Collection - ACR

Kill 5 Guards with a Scaffold after they have been stunned by Caltrops - 20

You will need:

Caltrop Bomb

You don't have to kill 5 Guards with one scaffold, it can be done multiple times to get 5 Guards in total.

You will need to find a Scaffold, which are scattered around the map. But there is one in the Janissaries' Camp, in the North West of the Map. You encourage the Janissaries over with a Cherry Bomb or by performing a Hook & Run, making them chase you. 

Either way, once the guards have close to the Scaffold, throw down a Caltop Bomb, stunning the guards with the caltrops. Then run towards the corner of the Scaffold, holding the B Button, making the scaffold collapse, killing the surrounding stunned guards.

How to craft a Tactical Caltrop Bomb:

Impact Shell

British Gunpowder

Caltrops

Mouse Trap is a children's board game which involves players making their way round the board attempting to get the Mice's Cheese. The players' mice can be captured by the mouse trap, which uses a convoluted mechanism to trap the mouse with the trap.

Caltrops are a anti-personal/anti-vehicle weapon which are scattered on the ground, causing a chaser to step on them, or a chasing vehicle to have a blow-out. The Caltrop are pointed spike tetrahedron, making the weapon to always land with a point facing upwards. The Caltrop was first used by the Romans against chasing horse-drawn chariots, attempting to stop the horse.

Roman Caltrop