Achievement name : 100-Chapter Playback
Description : Play through 100 Chapters.
Allright, now this Achievement can be confusing, it says "Play through 100 Chapters" meaning you have to play through 100 Chapters, from the beginning 'till the end! So if you drop into a game that has already begun, you won't get credit for it! Just make sure you're in the Lobby when you join, that's all. But the best way to get through 100 Chapters is to play Episode 5 Chapter 3 repeatedly, because you can get +50.000 Career Points (while playing on Hard) and +20.000 Slot Machine Credits while playing this particular mission. (Because if you play 5-3, you boost multiple Achievements at once, instead of just grinding the quickest level or whatever~)
People required: At least 2
The player (You) will get on the Turret, and your friend will feed you T-ENG (When the Laser is charging and your friend gives you 2500 T-ENG you'll hear a strange noise, and that means its LVL 2 or 3 Laser Beam, which causes massive damage compared to the origional Laser shot) You'll first have to try to destroy the 2 Turrets on the bottom of the enemy's ship, and then the upper deck turrets, that will give you 5 kills. Then just shoot the wings and the Turret, and the enemy will spawn Ospreys (Choppers) Shoot them down for the Killing Streak, and when you hit a 10 Kill streak inside the Laser, you'll have a 80 % chance you'll unlock 20.000 Career Credits at the end, then grab a Battle Armor, and board the Ship, kill the GAB-VS (Drill VS) and activate the Control Post as quick as possible, when the enemiess activate your Control Post you have to return to stop it. In the meantime, just try to get a killstreak, so you'll get even more points. After the 1 minute Data Post charge, there will be a timer in the middle of the screen, and the pilot of the enemies ship will just throw down Mystery Boxes, around 20 each 20 seconds. The boxes will drop at : 1:27, 1:07, 0:47, 0:27, 0:07. Its quicker to grab the Boxes with the Grappling Hook. If you're with 4 people, and you will all stay on the ship, just make sure that your Battle Gauge is 2500, if its 2000 and you all die, that will mean Mission Failed. When the ship blows up (with or without you) Spawn on the ship and just Spam Grenades in the main room, cause there will be like 15 guys down there. When the Chapter is over, you'll probably get around 10-20.000+ points, and when you have Superstar enabled, it will be around 30-40.000 Credits (+50.000 on Hard). Nice one!
(Please not that you HAVE TO activate the Control Post on the Enemies ship to get Credit for the kill, and so the points!)
Hope this helped.