Tier 1 Advice: Level-by-Level
The Tier 1 Mode for campaign is one of the most intense first person shooter settings in existence, vastly increasing difficulty and pitting players online against each other. The primary objective is to complete missions with the fastest time possible. There are various strategies that mainly depend on your playing style. However, each mission has a definite necessity for technique, which will be outlined here. Included are various tricks that might do you some good.
Mission 1: First In: This mission is somewhat lengthy, so it is best to conserve your ammunition when possible. The best way to accomplish this is to use your pistol, which has unlimited ammo. You are greatly limited by the computer (your teammates), so efficiency is paramount. Make good use of clock stoppages by going for headshots and melee kills. The biggest opportunities for freeze time occur when you are: 1) in the building with the lights out, and 2) in the tunnel when attacking Bala Hisar Fort. In both situations, melee every enemy as quickly as possible. This will gain you a mass quantity of freeze time. It is very easy to get killed doing this, so do it quickly.
Mission 2: Breaking Bagram: This is the longest mission, so you must get as many headshots and kill chains as possible to improve your efficiency. Don't worry too terribly much about ammo conservation as many dead enemies will resupply your PKM. Make good use of 2 things especially: throw grenades from the elevated position with the grenade resupply onto the clumped mortar operators and shoot the gas tanks at the end of the level.
Mission 3: Running With Wolves: This mission is unique in that much of the level is done on an ATV, so be sure to be efficient in your driving (don't crash). Be sure to run ahead of Dusty and kill your targets ahead of time when possible. Take your time with the Barrett: don't waste time by chasing the running target. Melee anybody that's alone to get a free two seconds, including the one that is standing in the corner after you mark the last truck. Finally, save your grenades for when you have to take out large quantities of enemies in Menjawar on the way out.
Mission 4: Dorothy's a B***ch: Your teammates are absolute slow-pokes in this one: run ahead of them and shoot enemies as soon as you have the shot. Use your two grenades as follows: on the fireside camp at the beginning (a free five second stoppage if you get the grenade on the fire) and on the patrol walking toward you after blowing up the trucks with the AC130. Finally when marking the AQ camp with SOFLAM, just hit the targets and go.
Mission 5: Belly of the Beast: This is the most important level in which to conserve ammo, for you will surely need it for the last engagement. Immediately exchange your shotgun for an AK47 and pick up ammo for it from dead guys. Use your pistol when fighting in villages. Suppress the DShK with as few rounds as possible. Go for headshots as much as possible to conserve ammo and time. Target RPG gunners first to keep from getting pinned down with low health.
Mission 6: Friends From Afar: Rush the initial sniper scene. This will take some practice to nail down. When the bad guys show up after this scene use both your grenades to take them out quickly, as this part is the most time-consuming. After this, pick up an RPG. When you ambush the people looking at their wounded buddy, use it to end them instantly.
Mission 7: Compromised: This is the shortest level, so gain freeze time with multikills and headshots. Immediately switch to your M21, as it has 500 rounds of ammo. Save your grenades for after you blow up the village with SOFLAM. After you get the M60 simply run through and strafe enemies with it. They really don't like the pig. Get as many multikills as possible with the CH47's Tail gun.
Mission 8: Neptune's Net: This mission is the most difficult to improve your time in as it requires the most precision. At first, wait to melee the first walking target until he gets near the other two so you can get the 6 bonus seconds of freeze time. When taking out the camp, you might as well restart your mission if you get spotted. When you get spotted by the chechens with the floodlight, immediately charge the hill.
Mission 9: Rescue the Rescuers: This mission is the most difficult to survive. At first, use your M203 to get as many multikills as possible. In the cave, use the shotgun as it is the most effective there. Upon leaving the cave, exchange your shotgun for the SVD's on the ground outside. When you run out of M4 ammo, get a G3 and use the semi-auto setting to save ammo and improve accuracy. On the last MG nest, use the SVD to take out the RPGs and immediately charge forward, taking out the MG gunner every time it is occupied. Wildfire will destroy the position once you get to the second row of rock walls, so get there as quickly as possible. Use prone when fighting here or else you will get killed by the chechens very quickly.
And use cover! This isn't COD!
One Hit Kill
If you wanna get one shot kills then use the shotgun. But make sure you unlock the red dot sight first. If you miss on the first shot its usually you ending up dead. But hit your enemy once in the body and your killstreak should be Great!