Far Cry 2 Hints

Subvert all the main faction missions in Bowa-Seko - the Southern Territory

You get this when you to the "Secondary Option" on every mission you can, that is the way your buddy will ring you up on your phone to tell you about.

Complete all Missions intercepted from cellular tower signals

After the tutorial you are free to go the a cellular tower and accomplish the mission given. The towers are marked by satelite dish icons and can be seen from far away as they are tall red towers. Just walk up to the tower and press Y on the metal box at the base of the tower.

There are 6 cell towers in total.

Get highest revives count in a ranked match

Just stick with your team, staying back a little bit and taking cover, when one drops run up to them, you'll be prompted to hit Y to revive them.
Just do this more than anyone else in the round, hitting the 'back' button will show you the scorecard and how many revives each person has.

Win a round as the Captain in Uprising mode (Ranked Match)

In uprising mode the Captain is assigned randomly, if your the captain just win the the game and you get the achievement, if your not the captain you can vote to change the captain and hope you get assigned it.

Upgrade one class 3 times (Ranked Match)

Upgrade one of your gun with three diamonds, you will earn diamonds as you rank up in ranked matches.

Play at least one full round in every Official Map (Ranked Match)

Just play a match on each map listed below, not sure if you have to play each map on each game type though.

Crude Awakening
Dirty Work
Last Bastion
Pit Bull
Love Shacks
Mud Maze
Cut Bait
Riot Control
Coup D'Etat
Rumble Strip
Rusty Beef
Far Cry
Clear Cut
Sand Blasted

Play at least one full round in every Game Mode (Ranked Match)

Self explanatory, being only 4 game modes you can get this fairly quick, just make sure you play the entire round and don't quit.

Deathmatch
Team Deathmatch
Capture the Diamond
Uprising

Get 500 revives (Ranked Match)

Revive as many teammates in each game as you can, to revive a team mate, when they get knocked down they will have a cross above there heads so you can see where they are, just run up to them and press Y.

Achieve Rank 30 (Ranked Match)

To Reach Rank 30 you need 1,500,000 XP

10 XP for killing an opponent

5 XP for doing it with bullets, with a headshot, with an explosion, with flames, with a vehicle, with a machete, and for executing a downed opponent

15 XP for reviving a teammate

You also get XP for capturing and scoring with a diamond and for capturing control points in uprising, or killing the enemy captain

Create a map and get it validated in all game modes

Start the map editor, once you're in hit the 'start' button and go to "Validation". Look under each game type there will be a list of things you need on your map with check boxes, add the things you need, working your way though until you get all check boxes checked. If you see any under "Map" that are blank and say something isn't clear it means you put that thing in a place it can't be, ie spawn point. Once all boxes are checked save your map and the achievement is yours.

Download and rate 25 usermaps

From the main menu go to "Map Community", then "Download New Maps". Download 25 different maps, once done, go back to the main menu and to "Multiplayer", then "Player Match", then "Create Match" then highlight "Map Cycle" and hit A. Add the first 15 of the 25 maps you downloaded into the cycle by highlighting them and pressing A (you can only add up to 15 at a time). Set "Private Slot" to the same number as "Maximum Players" is set at, then "Launch Match". Select "Force Launch" when available or "Ready", once the map loads check it out a little, then hit Start and go to "Cancel Match".
On the Summary screen notice it says to hit Y to rate, so hit Y and give your rating. Once the Lobby comes back up you'll be on the next map in line, repeat.

At the beginning of the game get the maximum of healing meds and then get your Xbox 360 controller, pull out the healing button(forgot which one), then stick a paper clip under it and over it and then smash the healing button in. This is called a modded Xbox 360 controller, do this before you start the game. Then turn the game on and at the beginning press to heal yourself and then paper clip will get stuck and you'll heal yourself so fast that the game won't realize that and you'll still have them all even after you used any. If you want to stop healing yourself just slap your Xbox 360 controller real hard and the button should get unstuck. I suggest YOU DON'T USE MODDED CONTROLLER ON XBOX LIVE FAR CRY 2. You'll most likely be banned OR kicked out of games all the time.