Aliens: Fireteam Elite/Ingress

Part 1
Luckily the first part does not have any real enemies, so it is good to adjust to the controls.

You will appear in the airlock open to the Katanga facility, enter onto the ship, go forward, then go down the large corridor to the left until you encounter the side door. Enter into the next room and afterwards, you will enter a type of control room. Go to the opposite end of the room and interact with the console on the left near the window. This will enable the door on the left to unlock.

Part 2
Continue through to the door on the left and along another corridor. It will open up to another room leading to a large looking room, where the commander will notify you that there is acid damage present. There are also some aliens seen on the left corridor, but they will run away in this time. Continue through this way to end up in the middle of a long hallway. Continue onto the left to find a collectible. To further the mission, go to the right and around the corner.

Final Part
You will enter into an area with the large elevator. Make sure that you replenish ammo, health yourself and deploy consumables before pressing the elevator button because it will take time for the elevator to arrive and you will be swarmed with aliens. it always helps to add sentry guns facing the room where the majority of the aliens will swarm.

The majority of the aliens will come from the open area opposite the elevator doors, though some fodder aliens will come from the ceiling on the left side, though by time that they first appear, the commander will notify you.

There will be a time when there will be a spitter in some unreadable place that you will need to shoot. Expect some Drones to enter the battle. Once the elevator has reach your floor and opened, "Haul Ass" and head in top the elevator quickly to complete the mission.