To get the best ending, you have to get the following for the story missions:

Pyrrhic Victory – Mason rescues Woods
Celerium – Celerium device recovered
Old Wounds – Kravchenko thoroughly interrogated – learned about potential mole in CIA
Time and Fate – Compound thoroughly searched – learned about potential mole in CIA
Fallen Angel – Zhao secret meetig details discovered
Harper successfully protected
Karma – Karma secured, DeFalco dead
Suffer With Me – Menendez does not completely succeed in manipulating Woods
Strategic Defense Coalition vulnerable
Achilles’ Veil – CIA undercover operative Farid survives
Strategic Defense Coalition allied with US military – Strike Force complete
Obysseus – Admiral Briggs survived & re-activated USS Obama’s defenses
SDC sent hundreds of drones to protect the USS Obama
The Obama’s defenses hold in time for SDC reinforcements arrive – the Obama was saved!
Karma & the crew of the USS Obama survived Menendez attack!
Cordis Die – President Bosworth is saved
Judgement Day – Menendez is captured

~~~~Strike Force~~~~~
Shipwreck – Freighter destroyed – Iran protected from SDC invasion
I.E.D. Afghan President saved – Afghanistan resists SDC pressure
FOB Spectre – FOB Spectre saved – India protected from SDC invasion
Dispatch – Tian Zhao assassinated

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The M1216 is the last shotgun you unlock in Call of Duty Black Ops 2. It is automatic but with a catch, you have to cycle (not reload) the magazine every 4 shots. But it is very fun to use, killing an enemy, cycling the M1216 and killing the next is highly enjoyable to say the least. This guide explains how to use the M1216 shotgun well and what the best class setup is.
The biggest downside of the M1216 is that you have to cycle the magazine every 4 shots. I tried to get around that by using attachments to increase the ammunition per magazine or to switch magazines faster, I even tried to use a perk that increases weapon switching and equipment usage time. None of those made the cycling any better, it took the same time and had to be done every 4 shots regardless.
When you encounter an enemy that is at the limit of your range be sure to try to use cover to get a bit closer before you start shooting. The main time of death is when you have to cycle your weapon, so making sure that an enemy is killed with the first 4 shots is vital. Also if an enemy took say 3 shots be sure to fire a fourth so that you have another 4 shots ready for the next foe.
The main skill in using shotguns lies withing moving around he map so that you are always within effective range of the M1216. Use the routes that you know don’t have many (or preferably any) long sight lines or good cover for an enemy with an assault or sniper rifle to hide behind. You should always be in the thick of the fighting with the M1216 as you are best up close and personal.
The class setup I recommend is the following:
This class is heavily focused around using the M1216 shotgun. That is why there is no secondary or grenades of any kind. Improving the effectiveness of the M1216 is much more preferable than any of those.
When you are in the thick of the fight there are going to be many very dangerous events. To decrease the number that can harm you use Flack Jacket and Tactical Mask as combined they limit how much impact equipment can have on you. To get you to the thick of the fight faster Lightweight comes into play. It increases your movement speed slightly, which also makes it easier to strafe enemies when you are engaging them.
The M1216 has very little range, but within that range it is very deadly. The Long Barrel buffs that raneg and makes the M1216 even more deadly. The Laser Sight and Adjustable Stock improve the hip fire accuracy of the M1216 which gives you more killing power in a smaller area.

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The KSG Shotgun in Black Ops 2 is very different from every other shotgun we have seen in Call of Duty. It shoots a single pellet rather than 8 of them. That adds a random element to the weapon, but it is very satisfying to us when it does work. This guide explains all of this in a bit more detail and gives some strategy advice as well as the best class setup for the KSG.
If you don’t know what I mean with that the KSG shoots only one pallet, below are two images that show you what a shot on the wall looks like from the R870 MCS (click for a guide for that weapon) which is similar to the traditional shotgun model and what the KSG shoots.
I did try using the KSG as a more long range rifle, but that didn’t go so well. The KSG has a much longer range than any other shotgun, but is only really effective at medium range when you aim down its sights (which makes it shoot where the iron sights indicate unlike the other shotguns in Call of Duty Black Ops 2). Beyond that you are going to need 2 hits to kill if you can hit at all and the KSG is very slow at pumping out rounds that even a sub machine gun will beat you at long range.
So the best way to use the KSG is like any other shotgun except that there is a random element to the weapon unlike most other shotguns. However, the KSG redeems itself but often granting you one hit kills outside the possible range of most other shotguns which makes it very fun and satisfying to use.
When you use shotguns you have to be close to the enemies to be able to effectively take them out. So the main skill in using shotguns lies within being able to maneuver the maps in such a way that you are always in close quarters when you engage an enemy. This takes map knowledge and practice, so using the shotguns might not be the best idea in your first game of Black Ops 2. When you do attempt to shoot an enemy it pays to take a little extra time to make sure your aim is accurate.
The class setup I recommend is as follows:
With the KSG you are either sprinting to get to the middle of the fight or you are in the middle of the fight. Lightweight gets you there faster and Flack Jacket and Tactical Mask stop you from being killed by most equipment which means you have to respawn less. When you get shot Toughness will help your keep your aim right as it reduces flinch (even when you aren’t aiming down your sights).
Notice that I am using 2 wild cards, lethal and tactical grenades aren’t as useful as what you gain by suing an extra perk and attachment for the KSG shotgun. A pistol secondary isn’t necessary as the KSG has plenty of rounds and a very slow fire rate so you shouldn’t run out of bullets in the middle of a gunfight.
Long Barrel increases your effective and normal range to make you slightly more deadly. Laser Sight increases your hip fire accuracy. You shouldn’t be aiming down your sights with shotguns (although sometimes with the KSG that can be useful) so Laser Sight assists you with every kill. Adjustable Stock actually increases the accuracy of the KSG, and anything that does is a worthwhile attachment for the KSG.