Just Cause 2

The achievement description is a bit misleading. The "unique" means that only one pass per bridge is counted and that somehow some bridges do not count for whatever reason. My guess is as good as yours why. I suggest however to go for big bridges with a big span as low bridges that link some Wetlands seldom count. You should have no trouble getting this if you can be bothered to fly low for an hour. I suggest taking a slow airplane if you should happen to crash a lot.

I will try and write down some coordinates of bridges I flew under to get this achievement. As I believe there are more than 30 bridges out there this list won't be complete. I invite you however to leave a comment with coordinates so that eventually we will have a complete list!

Update: coordinates also available on a nifty map made by Namcres at https://www.desmos.com/calculator/8aqwjedi5l. Enjoy!

X 11653 : Y 27689
X 12046 : Y 27606
X 10706 : Y 26715
X 11512 : Y 24439
X 11485 : Y 23661
X 16777 : Y 26418
X 19125 : Y 24490
X 18267 : Y 23421
X 15026 : Y 23778
X 14745 : Y 23661
X 24076 : Y 19670
X 25065 : Y 20548
X 25277 : Y 17567
X 24715 : Y 19733
X 30524 : Y 15441
X 27483 : Y 14138
X 28133 : Y 13139
X 27800 : Y 9751
X 28269 : Y 8214
X 29226 : Y 8641
X 26231 : Y 6246
X 25362 : Y 6174
X 28359 : Y 6733
X 28561 : Y 7417
X 27993 : Y 7873
X 25563 : Y 5132
X 25695 : Y 3957
X 23675 : Y 4715
X 20906 : Y 6123
X 18659 : Y 8084

Some additional bridges used by VaKeM who seems to have left the site. Many thanks.

X 9637 : Y 25266
X 8562 : Y 18956
X 8915 : Y 13314
X 8445 : Y 22212
X 9045 : Y 14570
X 17050 : Y 13034
X 17484 : Y 12693
X 16313 : Y 12379
X 17313 : Y 17161
X 18644 : Y 21418
X 17343 : Y 18495
X 9410 : Y 10724
X 8751 : Y 11904
X 7425 : Y 13675

If you should wonder how to see the coordinates, go to your map by pressing and look in the top right hand corner. You might need to zoom out in order to see them depending on the map background.

There is also a Youtube video on this topic. I take no credit for it! The author is steve0384. The video outlines different bridges than I did in my solution. This might help you if you have trouble getting the achievement!

Review 24 September 2014: Added button icons.
Review 17 February 2020: Added link to map by Namcres.

Just an addition to the other guides here: if you find it hard or too timeconsuming to fly under 30 bridges, here's a tip:
Whenever you see a bridge (this can be a very low one, like an overpass on the road), order the small plane from the black market and just drive under the bridge. No need in flying and this works for every bridges (the ones over water always have a little land on the two sides).

This way, whenever you encounter a bridge, you can easily add it towards the limbo count of 30.

This works very well when money isn't an issue (when you've completed most of the game) and you just want to add the last couple of bridges to the 30 needed.

The Bridge Limbo Achievement is best started following the many rivers in Panau not only are the bridges over the rivers high (if they span the canyon ) but flying in the river valley will get you used to flying the air craft I do not suggest large wing spanned aircraft as many of the bridges support columns are to close together to allow a large plane under them I suggest the Air hawk 225, Pell Silver bolt (sold at the black-market) or the SI-47 Leopard. The 474, I-86DP, Cassius 192 and G9 Eclipse all are either to big (wingspan) or to fast to make the limbos.

While you are trying for this Achievement since you will be flying all around Panau anyway fly over the tree tops of the gold dots on you map to help you discover all the locations this will help you in the Globetrotter Achievement and allow for faster travel using the Black market Extractions option. Also remember if you crash after going under the bridge and it counts it in the counter you will not have to go under it again just keep any eye out for cars, boats, street lamps or wires when going under overpass bridges or over low bridges over the water.

The peek airhawk 225 is a very good plane to use for this achievement. It is slow and very manuverable. Just play and complete a plane challenge (the harbormaster is an easy one. X: 1595 Y:13677). once you have the plane just use your map to find bridges to fly under.