Shadow Complex

Hello all,

Ok this is the strategy I used to complete the level 50 achievement (Serious Complex) in a couple of hours I started at level 24.

Use the Gold Coil Rifle and make sure you are playing on Insane.. FYI any Unlocked Gold Weapons will give you double XP, so use whatever you are most comfortable with however I prefer the Coil Rifle as it's best for headshots (which will still give you a multiplier). Next you'll need the Grapple Hook, the 2 Thrust Packs, and Missiles you can however alternatively use Unlimited Missiles which makes this strategy a little easier to do.

Near the top of the map you'll come across another lake (not the main one with the cottage), near the gold guns secret room.

Save your game in there, then exit to the surface and run up the side of the mountain using your grapple hook. There will be 3 enemies who you can melee or if need be headshot for a total of 5x experience bonus. Next run to the left and use your Inertial Dampner (not required) and double jump down the side of the mountain. Once you have hit the other side of the dock there will be 3 more enemies. Melee them and you will come to a WSA3 Devastator, one of the walking robots. Leave him for now and jump over to the left and another gatling gun enemy will be present, once you kill him your combo should now be at 9x. Now go back and finish off the WSA3 Devastator, with a missile strike at it's back or undercarriage, for a Max Combo. Killing this nets you a high amount of experience. Now, run back the the save room and once the game is saved, simply hit start and select 'load from last save' to have the Devastator respawn. Rinse and repeat.

I did not create the video and this is somewhat the same strategy as the one I just posted. Use this video as a general guideline.

Video Here:

If you're at the end of the game but don't want to start over to get your experience up, there's a save room on the far left of the map that you can access from the surface, on the right end of the lake.

Save your game in there, then exit to the surface and run to the left. There will be 3 enemies who you can melee for a 5x experience bonus, and at the end of this chain of enemies there will be a WSA3 Devestator, one of the walking robots. Killing this nets you a high amount of experience. Run back the the save room then simply hit start, and select 'load from last save' to have the Devestator respawn.

This is much faster than running through the rest of the map killing normal baddies for little experience.

Obviously, set difficulty to Insane for best results.

Geoff and jack from Achievement Hunters show us how to get the "Serious Complex" achievement for Shadow Complex. This is a great guide on how to get it. Its not the only way but its one of the best ways to do it that I've seen.

this one takes some time.. play the game on hardcore your first playthrough( get all collectables), this should put you at about level 30, then play your under 13% easy playthrough(easy diff). that should put you around 33-34, after this. start a new game on insane and play till you fight the first spider boss, after him climb up grenade the door and run through for the save. then quit the game, and start a new game on insane and repeat
repeat that about 30-40 more times and you will get this achievements.-- much easier than playing through on hardest diff. will take more time if u choose to play through again.

Okay, so the guides presented here are top notch, and work really well. However, if you're like me and have completed the game already, I was spending a lot of time trying to get to the save talked about. So, here is my alterantive method. It's not the fastest way, mind you, but it works pretty quickly.

First, start up a new game on Insane difficulty. The first part of the game, you earn no XP, so just get through it as quickly as possible ( I just jumped over the dumpster, melee'd the first four guys, shot the next two, then quickly aimed for the helicopter and took it down with 2 quick missile shots...but whatever is fastest for you). Once you are past that part, start playing as normal. Drop down, get the backpack, go back up, see the cutscene where the two guards are shoving Claire into the facility (or skip it, I skip them all to save time), Once inside, find your way straight through to the room with the Golden Guns, where you would normally pick up the pistol. Go in and get you gold weapon of choice (I always pick the Gold Coil Rifle). Once you have that, run back out and trigger the cutscene in the room, skip it, then jump on the desk and take out the turret. Skip cutscene. Then, you either go back into the vents and pick up the health pack down there (for a small extra XP boost), and continue back through the room with the camera. You can either shoot or melee the guy, then take out the camera. Next room is the save room. Pause, end game, repeat. I was netting around 1/5 to 1/4 XP bar each run, and while it sounds really long on paper, the whole process literally takes about 2 min. Again, it'sprob not the fastest way to gain XP, but if you're like me and don't wanna go all the way through the game again to get the save room in the video above, it's a fairly efficient way to get some decent XP.

If you've beaten the game and you're looking for a good route to take from the start, I found this route works best - 30ish to 50 in about 2 or 3 hours.

I know all of the other solutions work fine and mine will not be much different from the others, but I'm giving it a try:

After I completed all other achievements I started a new game on Insane. Work your way through to the gold weapons and pick one. Then work your way through the game like you would do on normal but be a bit more carefull.
When you reach the part where the chopper chases you, swim/run like hell and follow the road. You will have to drop down after a few meter so go to the bottom and go to the right. You will be in a save room.
Go back out from where you came and go to the left (crouch under the door). Shoot the vent and continue going to the left. You should see 2 guys standing above you and 1 walking around. When he is close to the other 2 guys, jump up and melee all three. You should have a 5x combo now. Quickly climb up the ladder and jump to the right. A cut scene should start and afterwards you will get a hugh amount of exp. Go back to the save room, exit game and load your last save. Repeat the last part until you reach level 50.

Note:
You will get unlimited grenades when you are level 40. This comes in handy and speeds up the runthroughs a lot.