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We have displayed the location of all the barrels required for an achievement in this guide for you.
Deep Rock Galactic Barrel Locations For Achievements
How many barrels on which floor you can see them in the headers.
Ground Floor Locations Total Barrels: 25
Let’s start from the first floor to our barrel guide.
First Floor (Primary Mission Area) 13 Total
This area is where you spawn in, select missions and enter the dropod. This does not consider going to upper levels in any capacity just yet. Lets assume you are just leaving the spawn rooms.
After leaving your spawn area, you will see 3 barrels near the Season terminal. Please find the blue highlight, this shows the catwalk you will need to take later to reach 2ND FLOOR for more barrels. 
Proceed to the bar, 1 barrel will be near the entrance. 
Enter the dance floor, near the music machine there will be 4 more barrels. Again, the blue highlights the catwalk you will need later to access 2nd FLOOR. 
Go towards the forge and space rig – you will find 2 more barrels near the rig blue forcefield (do note if you play on lower graphics, they may be more visible). 
Finally, go to the Forge – near it you will find 3 more barrels. 
2nd Floor Catwalk 9 Total
Enter the 2nd floor elevator, located near the large window pane in front of you, which you will see when spawning in.
As soon as you get off the elevator, turn right to find 1 barrel. 
Now, go along the catwalk which is parrallel to the huge window(NOT the direction of the aforementioned barrel). Here you will find 1 green barrel (its part of the roster, do take it) and 1 blue barrel. 
Proceed forward on the catwalk, do not enter any vents just yet. You will soon reach an open area with 6 barrels.
Do note the blue highlight, this is the place where you found the Green barrel previously. 
Finally, take the left elevator to ‘Top Hangar’ for the final barrel batch. 
3rd Floor 3 Total
Welcome to the highest level in the space rig shaft –
Upon leaving elevator and going into the open area, you will find 2 and 1 barrels spread out on the catwalk.
This Brings Up to a Total of 25 Barrels Across All Floors.