Reaching Rank 40 in Sniper Elite Resistance is a requirement for the Climbing the Ranks Trophy/Achievement. This can be a long, arduous task and can take the entire duration of the game. However, it is possible to grind out the process fast, by farming and exploiting game mechanics.This Sniper Elite Resistance guide has everything you need to know about quickly and efficiently reaching Campaign Rank 40.Multiplayer is unnecessary to attain rank 40, and can be accomplished entirely offline. The XP earned from all actions persists between reloads of saves and mission restarts. In order to farm XP, as well as kill counts towards the other Trophies, simply identify a larger cluster of enemies in any given mission. Next, create a manual save, and then terminate all of the enemies while relying on distance and landing headshots for maximum XP returns. Now reload the save or restart the mission, and do it all over again until sheer boredom sets in, and you are ready to move on to the next mission.The ideal mission for this is Mission 6, Assault on Fort Rouge where almost two dozen enemies can be picked off with a Rifle right from the starting location. Simply scope and kill all visible enemies without worrying about stealth, as the additional enemies can also be targeted as they wander outside. Once done, reload the save and do it all over again.Be sure to gather all collectibles as well as unlock all available Propaganda Challenges by finding the posters in the missions. Completion of these will unlock weapons, but are also a good source for significant chunks of XP.That is everything you need to know in order to grind to rank 40 in Sniper Elite Resistance.