Halo: The Master Chief Collection - Halo 2 - And So It Begins... - Halo 2: Collect the Master Chief toy in Delta Halo. This achievement is fairly easy to unlock.
On the mission Delta Halo, you need to acquire a ghost near the building where you activate the bridge. One you have a ghost switch to classic graphics and head backwards and up the hill.
Using the boost of the ghost you will be able to climb the hill and make your way over to where the toy is.
Run over and it up and your achievement should pop! Enjoy!