Headhunter: Redemption

To open the Star Locker, break Hank Redwood's records in Leila mode, then complete the game once. The Star Locker contains all weapons with unlimited ammunition. Note: You may not be able to complete the game normally if the Star Locker is used.

When you battle Ramirez's spiders, shoot them once then stand over them. Press Action, then guide the spiders towards the door. Press Action again to make the spiders jump at the door. Eventually they will melt the mechanism with their acid blood and you can enter.

In the manufacturing section there is a load of boxes to climb if you want to go up to the door and turn on the door below. you have to turn right and you jump over the box at the end of the passage and the crystal will be on the floor.