This is the walkthrough for Maktar Nebula.
Defeat the thug at the start as quickly as possible so you don't have to deal with more Chickenbots which are kind of annoying but they're easy to defeat. Turn left to some poker machines. You can win ammo, bolts, health and a skill point called Clank needs a new pair of shoes. Keep wiping out the thugs until you go to a lift. Be prepared for an enemy and get a Lancer out. Go on the lift and when the lift stops, defeat the henchmen. There is a group of Chickenbots and shoot them with your Lancer, just for two thugs that are going to suddenly appear. They hide behind the big lights. After you've defeated that group go to a spacelimo and wait for a moment. Then ledge climb. Climb to the left and go up a ladder and get ready for a lot of firing. Get your best gun out and fire like mad and be careful of the holes between the platforms. After you defeat the henchmen, find a box on the right side; jump, then jump again to get a platinum bolt which are special bolts. Later in the game, there is a weapon modification salesman. To get them they cost platinum bolts not normal bolts. Wall jump to the top at the end of the track then jump down and keep firing or just simply use first-person mode and pick them off. There are also poker machines here. There's only about 10 more enemies on this track so keep annihilating all the enemies. Then fill your guns with ammo at a vendor and complete the arena challenge and use the Electrolyzer to get back safely. There will be a movie before the second Electrolyzer puzzle.
To the moon
First you defeat a henchman then turn right from the starting view. There's not many enemies this way but there's a lot of the Tractor Beam used on this track. Defeat a few Chickenbots and use the Megacorp Tractor Beam to remove an obstacle at the start, then use a robot to get to the next room. The room is so empty except for one bomb that you will need to use the Tractor Beam; firstly, defeat all the bots. Use the bomb to open some doors. Defeat the henchman and use the Inspector-Bot to catapult up to the door between two poker machines and then you go up a ladder. You defeat a henchman and break some boxes. After defeating that enemy, turn left and get a bomb to open up a door then fall down to the ground and catapult some bombs at these U.F.O.'s. Then enter a space limo.
On the moon
When you're on the moon, kill the enemies and turn the bolt crank. Whack the towers at the glowing part and follow a bright yellow, glowing line on the ground. Ratchet pretty much does the same thing over and over again. If you come to a special jump pad that has arrows, go on to it then press X and Ratchet will do a super high jump. Break all the towers to complete your mission and then go into the limo.
Platinum Bolt #1 - After getting into the first limo, you climb those ladders, then go to the right side and you see some crates, don't destroy them, use them to climb that little wall and you get the Platinum Bolt #1
Platinum Bolt #2 (Clank Required: Go to Planet Endako to get him) - On the moon, behind the limo you used, there's a platform with a Jump Pad and a Platinum Bolt in the top, to get it, go to last tower place and glide until you get to that platform, jump on the Jump Pad and you get it!
Vandalize - Bust up the Maktar Resort
Destroy all the lights and 'comercials' (flying "TV's" with Megacorp and Gladiator signs) in Maktar Resort, use the Visibomb Gun (found in Planet Barlow in the Gadgetron Vendor) to destroy 3 big lights in the roof of one of the rooms in the Tractor Beam track (not inside!).
2B Or Not 2B Hit - Deafeat B2 Brawler without a scratch
Self-explanatory, defeat B2 Brawler without taking a hit.
Wrench Ninja: Blade To Blade - Defeat Chainblade with the Wrench only!
Pretty self-explanatory, I recommend to get the Planet Aranos' Wrench first.