Far Cry 2

Once you arrive in Bowa-Seko, you will have to complete a few missions to get things moving and unlock your Southern Buddies. Once you have done so (The "Dawa ya moto ni moto" achievement) start working your way through each square of the map. There are 3 in a small, isolated part of the Southeastern sector that do NOT count towards this achievement (as they are in an area only accessible on the last mission).

When you get to Bowa-Seko, Don't start doign missions, look at your map (back button) and see the safe houses in the area, go to the closest one and so fourth until you unlock all the safehouses on that section of map, now do that in a down up motion (go to bottom of full map, then go right one map square, then go to top of full map, then right one map square, then down to bottom of full map, you should have went through 9 squares of map) Which should net you the achievement fairly quick.

For anybody still playing Far Cry 2 in 2023 and later, I found the following maps by Game Pressure to be excellent for locating both the Safe Houses and the Jackal Tapes. See a link to the Game Pressure site for

Leboa-Sako (Northern map)
https://www.gamepressure.com/farcry2/general-map-leboa-sako-...

and Bowa-Seko (Southern Map)
https://www.gamepressure.com/farcry2/general-map/zf16ec

These maps are great because they show the entire General map, but then also clearly break them down into the individual 9x9 sectors, so you can mark off each Safe House as you unlock them.

Hopefully this is helpful to someone.