Red Faction: Armageddon
59 Achievements
12-15h
Field Surgeon
Perform Revival 25 times in Infestation.
2.8%
How to unlock the Field Surgeon achievement in Red Faction: Armageddon - Definitive Guide
Using shell can help the reviving person stay out of trouble. The revives don't save until round end, and the achievement will pop at the round end screen.
Take note though, you can only get knocked down so many times in a round. If you go past what the game allows you (it shows how many lives you have on the screen) then you die and cannot finish the round. So always make sure you have one life left and finish the wave. Rinse and repeat until you and your friend have 25 revives.
Must be done in online Infestation.
In Infestation, when a teammate's health gauge is emptied, they will begin 'bleeding out', in which time they will have 25 seconds to be revived before they die which renders them a spectator for the remainder of the wave. When a teammate is downed, run over to them and hold to revive them. Do this 25 times and the trophy is yours.
Simply wait until a team mate is downed and then hold to revive them. They revive instantly, so this isn't hard at all. If you have a boosting partner, you can just take turns downing yourselves and healing each other and it will work for this achievement.
If you need a boosting partner, refer to this thread.