-Note: This requires that the free FanPack maps map be downloaded. It is possible to earn some fast A.C.E.S. points on the CQB Dark map--do this on solo so that no enemies are triggered before you are ready for them. Begin a Terrorist Hunt offline and make sure Lone Wolf is on. By doing this, your AI partners will not spoil anything for you. When the game loads, quickly change over to your pistol (Desert Eagle is recommended) and start walking to the corner of the wall on your left. As you near it, sprint around the corner and go up the ladder. The man at the end of the other room may attack you or call for back up, which is perfect. Do not stop to engage him or his friends. Quickly climb the ladder and take cover beside the concrete wall crouched down so that no one below can shoot you. Aim at the ladder and wait for them to come up one by one. When the count reaches 37 terrorists to go, it is time to trigger more. Go down the ladder and go to the room where you began. Go out into the courtyard ahead and move behind the pallets of sandbags. Move just so you can get a shot on the person in the building across from you on the right side of the doorway. Shoot him and run back for the ladder, then go back up and repeat the process. The count should now be 29 terrorists. Run across the map to the other ladder, entering at the closest door to you (behind the broken down van). Shoot at either of the men you encounter (in the window of the middle building or the corner of the far right building), then run for the ladder and go up. Repeat the process. Allow one minute to pass without terrorists to guarantee that it is safe to continue. Move to the wall behind you and do not leave the top of the ladder. Fire a couple rounds, then go back to the ladder. Repeat the killing and continue moving out into the outer perimeter of the building with the ladder. Once you narrow it down to about three to five terrorists that will not fall for your trap, hunt them down and kill them. You can clear the map on your own. You can do this under the Realistic setting at high enemy density. Every kill you make should be while they are on the ladder and you are behind them. You will get Kill At Close Range or more often than not, Kill Opponent From Behind A.C.E.S. points. Kill 40 terrorists like this and for 120 A.C.E.S. points per round.
-To earn a huge amount of A.C.E.S. for Marksman and CQB and a little bit of Assault, equip a sniper rifle with 6X12 scope Note: Any of them except for the first sniper rifle will work, preferably the automatic one. Play Story mode and select the chapter "Monorail". You will start with two doors in front of you--do not open them yet. Find the two supply boxes and open one to receive more ammunition for your sniper rifle. After that, open the doors and order your companions to guard the left entrance of the monorail. Note: If this isn't done, you will be killed from behind. Take cover, but not behind the plants. Also, make sure you don't cross the monorail hall or you will either be killed or will not get what you are looking for. The methods to getting A.C.E.S. after that are as follows:
CQB Once behind cover, pull out your sniper rifle but remain incover. You need to scope twice with your sniper. When the screen goes into focus, blind fire at the turrets and men, but beware as some rush. Your companions should take good care of them.
Marksman This is a bit tougher as it involves you not blind firing but coming out of cover to shoot. Scope into any of the men you see and always make head shots. Some might be too close for the "Long Range" A.C.E.S. and if you just shoot them on the chest, it will not get you the points. Some may rush but, once again, those two soldiers will help you. Assault Advance through the monorail to your right while taking cover behind a blue box. A shielded opponent will emerge. Snipe him on his leg or arm and he should fall. Proceed forward until reaching the area where enemies charged down the stairs. There should be another shielded opponent on the opposite side. Either let your companions take care of him or you deal with him personally. This strategy should get you a massive amount of A.C.E.S. After every time you finally kill the shielded opponent on the opposite side of the bridge, just reload checkpoint and do it all over again.