An easy way to earn extra points and kills during Deathmatches is to set up as many remote turrets and sensors as possible. You will be awarded extra points just for placing these, plus the turrets will attack and kill most enemies who come within its range, giving whoever set up that turret the kill points. The sensors allow the turrets to attack enemies that are longer distances away from the turrets position. This is also an easier way to hold a base during capture and hold missions/matches.
Onslaught
During the Onslaught mission, the best strategy for surviving the Derm Forces is to simply repair the generator, then repair the two turrets. One is on a hill and another is up towards the roof opening. After that is accomplished, go up to the roof opening where the flag is located in the capture the flag games, Then, go to the nearest Inventory Station and select Medium Armor. Select your pack as Remote Turret. Deploy two turrets on each end of the turret side of the base and deploy a few more where each opening to the basement is located (near each of the Inventory Stations). Then, hide and let your Mortar Turrets (you should have switched them at the beginning) and Remote Turrets do all the work. After the first wave is over, switch to the Heavy Armor (Juggernaut Armor) with a Shield Pack (activate it frequently).
Picking off enemies
There are many floating patches of land that are some times useful to pick off enemies. Some of the soldiers will see you before they get killed and start shooting underneath you. If this happens, jump off, spin, and while in the air, shoot him.
Protect Your Flag & Base
You can protect your flag by surrounding it with mines and also keep remote turrets nearby. You need to keep your generator room protected with remote turrets. To get remote turrets set medium/heavy armor and your backpack needs to be the remote turret. Aim where you want to place it, press circle, and fire (L2). Hope this helps all you newbies.
Quick ammunition
When you are in need of ammunition and do not have an ammo pack (but for example have an energy pack), on some maps there are bunkers with packs in them. If you do not have an ammo pack and there is one on the ground, swap for whatever pack you have to get instant ammunition. You can do this back and forth as many times as needed.
Run over enemy for fast kills
Set the map to be a capture the flag level and make sure it has flat land, but a long stretch between the bases. There can be mountains, but make sure the path back and forth is just flat land. A good example would be Katabatik (a snow level). Get your vehicle to a fighter and set it to third person vehicle under the player menu during game play. This allows you to see where you are driving a lot more than in a first person vehicle. Drive around in the air between the bases, but stay away from the enemy bases. They will more than likely have a heat seeking turret waiting for you. When an enemy approaches your base, fly down and hit him from above, from in front, from behind, or from the sides. It will instantly kill him if done correctly. It can sometimes be difficult, but will be easy most of the time.
Satchel charges
During the first deathmatch, get to the tower. There will be satchel charges that you can plant.
Secret conversation options
To say phrases to other players not previously capable of such as "Repair me", "I need a ride", and others, create a character to your liking. Then, in your buddy list enter "CHAT-TEST". Note: This code will only work in the rooms marked "Inevitable" with an arrow pointed towards them.
Secret statue
Start a one player bot match. Set "Bots" to "Off" and "Max Team" to "1". Choose the Slapdash level under the CTF heading. Go to the vehicle station and get yourself a jet (easier to see). Follow the perimeter of the level (next to the out of bounds wall) until you reach a clearing in the top right corner. Get out and look in the area to find a statue.
Single player Botmatch survival and fighting
Use the following tactics to stay alive longer in a battle and get a good number of kills and points before you die. Always set your Inventory to Medium Armor and guns to Spinfusor, Chaingun, Missile Launcher, and the Blaster. Save the Blaster for last -- since it runs on jetpack fuel, you have unlimited ammunition for it. Next, set your Pack to Repair Kit. When injured badly, hide in a mountain pit on the sides and use this to regain energy, then continue your assault. It also makes for healing your Base Turrets and Sensors. Set your Grenades to Flares (in case Heat Seeking Missiles target you or a fellow teammate. Set your Vehicle to Fighter, since it has agility, powerful Twin Heavy Blasters, and is easy to control. Now that you are set up for battle, get to an Inventory Station. Get equipped, then get to the Vehicle Station and hop into your Fighter. You are ready for combat. Use the following tricks for a better chance of a successful assault. Use your Fighter to fly over there, shooting at any enemy target that you see. Get to their base, and if a Heat Seeker starts to lock on to you, quickly land your jet somewhere safe. Get to the top of a mountain where you have a good view on their base and they can see you. Stealth is always the key to survival. Do not blow your cover. Stand there, use your lock on, and shoot at targets. To increase your chances, locate their main Sensors and Base Turrets and destroy them. If there is no one in your way and you are feeling lucky, try to make a run for their base. Get in there and take out their generators to slow them down a lot more. Then, get back to your hideout, making sure no one is following or watching you. The AI opponents will not remember where you respawn. If you are playing online, get in your fighter and break back for the base, because you will survive too much longer.
Tree Stealth
First, play the paranoia level. Then go to the inferno side and there will be a tree. Jet pack up to the top. Look down at the top of the tree, in between the leaves you should see the top of the tree. Try to land on this, and then position yourself where you are between the leaves.
Turrets and armor
The following turrets are best against the corresponding armors:
Missile Turret: Light and Medium armor.
Plasma Turret: Devastating to Heavy Armor as well as Light and Medium.
Mortar Turret: Heavy armor.
Anti-Aircraft Turret: All armors.
Sentry Turret: Note: You cannot deploy it. The Sentry Turret destroy anything and is best avoided.