In the first mission, you must go through training. To place in the top three, you must beat the Gauntlet Parkour in under 33.65 seconds. This is quite challenging, and it is recommended to try this as one of the last achievements you attempt to unlock. The time is very limited. If you make a single mistake, you have to restart (pause the game and select "Retry"). This is skill dependent and could take a while. You need to practice and memorize all the moves. You must kill all 15 enemies in the parkour. If you miss one, it will add a few seconds to your time. A good loadout to use is the EPG (rocket launcher), EVA-8 Auto (shotgun), and Arc grenades. Use Arc grenades to kill groups. Always do wall dashes from one wall to the next to gain speed.