Turnabout in ARC Raiders is a Celeste quest that sends you to Spaceport's North Trench Tower to upload blackmail files against OTTM. It becomes available after completing the Digging Up Dirt quest and rewards weapon parts for your trouble.
Complete the Turnabout quest in ARC Raiders
Step 1: Accept the Turnabout quest from Celeste in Speranza when it becomes available.
Step 2: Check the Keys section of your stash to confirm that the Spaceport Trench Tower Key granted by Turnabout is present.
Step 3: Move the Spaceport Trench Tower Key from your stash into your raid inventory before starting a match.
Step 4: Queue for a raid on the Spaceport map.
Step 5: Navigate to the North Trench Tower in the northernmost part of Spaceport, between the western and eastern hangars.
Step 6: Use the Spaceport Trench Tower Key to open the locked door at the base of the North Trench Tower.
Step 7: Clear out any Pops and Fireballs inside the tower so they cannot damage you while you work.
Step 8: Climb the staircase inside the tower to reach the upper level.
Step 9: Look around the upper level to locate the yellow terminal.
Step 10: Interact with the yellow terminal to upload the blackmail files against OTTM to Celeste.
Step 11: Extract from the Spaceport raid to return safely to Speranza.
Step 12: Talk to Celeste through the Trader tab in Speranza to finish Turnabout, which rewards 2× Heavy Gun Parts and 2× Medium Gun Parts.
Complete Turnabout if the Spaceport Trench Tower Key is missing
If the Spaceport Trench Tower Key is not available in your stash or inventory, there are still ways to reach the North Trench Tower and complete the quest.
Step 1: Open your stash in Speranza.
Step 2: Check the Keys section for a Spaceport Trench Tower Key, which works for both trench towers at Spaceport.
Step 3: Free several slots in your stash if it is close to full, because quest reward keys may not appear when the stash has no space.
Step 4: Play one or two raids after accepting Turnabout if the Spaceport Trench Tower Key is still not visible.
Step 5: Reopen your stash after those raids to see whether the Spaceport Trench Tower Key has appeared.
Step 6: Run additional raids on Spaceport until you find a Spaceport Trench Tower Key as regular loot.
Step 7: Move any Spaceport Trench Tower Key you obtain from your stash into your raid inventory before starting a Spaceport raid.
Step 8: Join Spaceport raids even without a key, because another Raider may have already unlocked the North Trench Tower door.
Step 9: Enter the North Trench Tower if its door is open when you arrive.
Step 10: Go up to the upper level of the North Trench Tower once inside.
Step 11: Interact with the yellow terminal upstairs to upload the blackmail files.
Step 12: Extract from Spaceport to return to Speranza, where you can finish Turnabout with Celeste.
