CellFactor: Psychokinetic Wars

Finishing all 3 challenge modes gives you 480,000 points.

Then the fastest way to get points after that is to make a private CTF player match on Training Room, each capture nets you 200 points and the distance between the flags is really short with the guardian's SuperSpeed and speed increase reward.

Testing this method im getting an average of about 96,000 points/hour, oh and you dont need 2 people to start the game so you can start it by yourself.

WARNING - WILL TAKE JUST OVER 5 HOURS TO COMPLETE.
Step 1. Complete all the single player challenges.
Step 2. Go to customize and select Guardian then rewards and choose Speed Inc. for REWARD 2.
Step 3. Go to multiplayer then player match then host private match and choose Training Room as the map and Capture the flag as the game type and choose time limit = 0 score limit = 0 then start the game.
Step 4. Now you need to use the LB button and run back and forth between the flags till you hit 1,000,000 points.
Extra Step. You can set up each match to 60 minutes and do it 1 hour a day so you don't get too bored and will get in 5 days.

Finish all the challenges for Guardiian, BlackOps and Bishop, This nets you approimatley 478,000 points.
=-=NOTE: After you complete a challenge, simply re-doing it will not earn you any points=-=

After you have completed all the challenges, the fastest method avalible to you is to start a Multiplayer> Player match> Host private match on the level "Training room" as it is really small and the distance between the two flag points is just over a teleport's distance away. Set the game type set to Capture The Flag. Set the Score limit to zero (this allows you to keep going until the time runs out, in other words... it's the no score limit option), time limit to however long you want to grind.

I highly recomend the Blackops, with the second reward set to Teleport drain reduction (changeable from the main menu>customize) , this lowers the physic cost of your teleporting ability allowing you to teleport twice per flag score (one to the flag and once to the home point for the score) most of the time.

There is also a Green emblem that supercharges your physic for a limited amount of time on one of the highest platform this allows you to just teleport till the flag is in your hand and teleport back to you score. and it respawns around every two minutes or so.

This is by far the quickest method I know of and should net 100,000+ per hour I know it gets tedious but it's 20x faster than killing the bots, assumning you get a kill every 7 seconds

=-=Note: Simply quitting to the dashboard has caused gamers to lose their point earnd in that session so remember to quit to the main menu at the end of the game beore trying to jump to dashboard.=-=

All other guides are correct, but I'd like to add extra information. I'm working on this achievement right now, and the quickest way to do it is definitely what the other guides suggest, but I add little tweaks on the definitive setup.

So, after you complete all single player challenges, you will have most of the bonuses for each character. I tested out 4 different loadouts with the 3 characters. Here are my average results:

Bishop, with Speed bonus : 100 flags / 15 min.
BlackOps, with Reduced Teleportation Cost : 101 flags / 15 min.
Guardian, with Speed bonus : 115 flags / 15 min.
BlackOps, with Speed bonus : 125 flags / 15 min.

Therefore, you should really go for the Speed Bonus loadout and BlackOps character to cut down on the time this achievement will take you.

Simply create a private match, Capture the Flag, on Training Room, and play alone. The strategy is to teleport only 1 time per round-trip. Teleport towards the capture, run when you carry the flag, rinse, repeat. Try to run in a straight path between the vents, and teleport on the way back.

Alternatively, using the Run ability on the way to the flag with the Guardian gave the second best results...so if you want to mix things up, you can play a little bit with the Guardian.

Have fun (not)!

I've discovered that you don't actually need to play online in Ranked/Private Matches in order to gain points for this achievement, as you can actually do it in System Link.

Simply select System Link, and place yourself as the Host. Select Capture The Flag on the Training Map, and then choose the Time Settings. Make sure your Flag Capture Limit is set to 0. Launch the game, and then you will have to wait for a moment. The game will then auto-start, and allow you to select your character.

The opponents flag will be right in front of you, simply run across and capture it, and bring it back to yours. Each flag capture gives you 200 Points.