Preacher's Path - 30
Finished all the Preacher Missions
This achievement is unlocked with natural progression of the single player campaign, and cannot be missed. This is for completing the last Preacher Mission, which is “Shut it Down” (Mission 13).
Stump's No Chump - 30
Finished all the Stump Missions
This achievement is unlocked with natural progression of the single player campaign, and cannot be missed. This is for completing the last Preacher Mission, which is “Bump in the Night” (Mission 12).
On the Clock - 10
Completed the training in Through the Eyes of Evil in under 18 seconds
During Mission 2: Through the Eyes of Evil (Training Mission), you will be asked to complete some very easy tasks during basic training. At the end, you will be asked to run an obstacle course, and after deductions your time must be 18.0 seconds or less. Before starting the course, switch to single shot (down on d-pad) and switch to iron sights for aiming. Run the course a few times and memorize the patterns, and aim for headshots. Eventually, you should be able to run the course very fast without reloading and getting mostly headshots. You will get 30 second of deductions if you get all 16 enemies with headshots.
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Leftover Lead - 15
Completed the sniping section in Shore Leave without missing a shot
During Mission 3: Shore Leave, the mission will end off with a sniper section. For this achievement you must kill all 7 marked enemies without missing a single bullet. Remember, you are able to kill unmarked enemies, and you can still get the achievement, but you are making it much harder for yourself. Remember to aim high to compensate for bullet drop, especially for the last two enemies and only shoot when they are standing still!
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Vender Bender - 10
Destroyed 90 market stalls in Hot Pursuit
During Mission 4: Hot Pursuit, you will begin the mission driving in a large truck. During the mission which is about 10 minutes long, you will need to take out 90 market stalls, which are just street vendors scattered around the area. There is one particular session you come across where you will be able to get most of them, and as long as you try your best to drive near the side of the roads and take opportunities to run through them with possible, this achievement is actually quite easy.
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Double Header - 10
Killed two enemies with one bullet in the Changing Tides mission
This achievement is pretty much scripted. During Mission 5: Changing Tides, you come to a part where your teammate asks you to take out both enemies using 1 bullet. Just wait for the shot to line up and take them out. If you fail, feel free to restart the checkpoint. NOTE: There are multiple ways to get this achievement, but this is the best way, especially if you are playing on hard.
View the video below for additional info:
Release the Kraken! - 15
Killed 20 enemies during the boat exfil in Rip Current
During Mission 6: "Rip Current" you will come to a part where you are put into a boat with a grenade launcher for exfiltration. At this point you must kill 20 total enemies before you get to the end of the mission. Just use LT to aim, and RT to fire, killing as many people as possible. If you come to the part where the boat starts reversing to avoid damage and have not unlocked the achievement, just restart the checkpoint.
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Tag, You're It - 10
Caught Faraz within 15 minutes in Finding Faraz
During Mission 8: Finding Faraz, you will spend most of your time chasing Faraz through the streets. You must complete the section where you begin chasing him to the part where you catch him in under 15 total minutes. Just play the game as you normally would, although you can be a little aggressive if you don't think you'll make it, and 15 minutes should be plenty even on hard. If you were unsuccessful, try replaying the entire mission on Easy and running through as fast as possible, and you should be able to get it done in under 10 minutes.
Target Practice - 10 (Secret Achievement)
Shot down the targets in the training camp caves in Connect the Dots
During Mission 9: "Connect the Dots" you will come into and encounter enemies within the training camp. Clear them out, and then take you time and shoot every target available. There are about 12 total.
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Storm Watch - 10
Got through the sandstorm without hitting any vehicles in Hello and Dubai
During Mission 10: "Hello and Dubai" you will come to a part where you are driving on the wrong side of the highway (freeway) during a sandstorm. You must make it from the beginning to the end of this section without hitting any cars. This section is relatively short, and you can restart the checkpoint if you touch another car, or fail to unlock the achievement by the time you get to the exit ramp.
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Dirty Laundry - 15
Found the grenades in the laundry room in Bump in the Night
During Mission 12: Bump in the Night, you come to a section where you are asked to chase "Sal Al Din". Just follow him and take out an of the enemies you encounter. You will go through some halls, and upon seeing a door to you left, you will be able to open it and pick up the grenades at the end of the room. For this achievement, it may be best to view the video:
Room Service - 20
Unlocked all door breach options
See "Master Locksmith"
Master Locksmith - 15
Used each breaching option at least once
Keep in mind that the achievement descriptions are reversed and you may not unlock these as you think you should. Most people will unlock "Master Locksmith" before "Room Service".
There are 7 types of breach options, and you have to get breach headshots to further unlock the next option until you get all of them. To ensure that you will get enough kills in 1 playthrough, you want to ensure that you get about 2-3+ headshots per breach, and if you are unsuccessful, you can restart the checkpoint. These also transfer between playthroughs, so there's no big stress about missing it on your first time around.