Payday: The Heist

For this trophy you need to choose Diamond Heist on at least hard difficulty. After opening the vault and stealing all the diamonds, you will have to escape to end the heist. Instead of escaping, wait and defend yourself until the trophy pops.

On the last objective which is 'Escape', Bane will fly in with the helicopter and waits for you at the roof. If all teammates go to the helicopter, the heist ends. If at least one teammate who is not in custody doesn't arrive to the helicopter, Bane will fly away after a short while because of the heat of the battle. So basically for this trophy, all you need to do is wait until Bane flies in with the helicopter and leaves again for a total of seven times.

This requires you and your team to stand against several assaults since it can take some time for Bane to fly in with the helicopter 7 times. It's essential to find a good defending spot. There are a few good spots that are easily defended which are inside the vault, on the staircases or behind a helipad on the roof. Make sure you destroy all cameras if you're taking stance inside the vault.

Since you need to defend for a while, you want to bring with you at least 3 ammo bags. The extra start-out ammo upgrades that you can unlock in the Support tree could help you a little. If you or another player have the Wolf Pack DLC, then it could also be helpful to have the crew bonus 'Big game hunters' which will increase the ammo for all teammates besides the one that holds the bonus. It unlocks at reputation 29 in the Technician tree.