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Get Alternate Ending:
After final cut scene, wait for the credits to finish to watch yet another cut scene. If you are playing on Legendary difficulty, there is yet another (but small) cut scene after the one after the credits. (Two total after the credits if on Legendary difficulty).
Unlock all achievements and collect all skulls.
Unlock Multiplayer Armor Parts:
Complete the indicated task in Campaign mode to unlock the corresponding armor part in Multi-player mode.
Spartan Scout Shoulders: Earn the "We're in for Some Chop" achievement.
Spartan Scout Head: Earn the "Used Car Salesman" achievement.
Spartan Scout Body: Earn the "Too Close to the Sun" achievement.
Spartan Rogue Head: Earn the "Spartan Officer" achievement.
Spartan ODST Head: Earn the "Spartan Graduate" achievement.
Spartan Mark V Head: Earn the "UNSC Spartan" achievement.
Spartan EVA Shoulders: Complete "The Ark" under the Normal or higher difficulty.
Spartan EVA Head: Complete Campaign mode under the Normal or higher difficulty.
Spartan EVA Body: Complete "Tsavo Highway" under the Normal or higher difficulty.
Spartan EOD Shoulders: Complete "The Ark" under the Legendary difficulty.
Spartan EOD Head: Complete Campaign mode under the Legendary difficulty.
Spartan EOD Body: Complete "Tsavo Highway" under the Legendary difficulty.
Hayabusa Shoulders: Collect nine hidden skulls.
Hayabusa Helmet: Collect thirteen hidden skulls.
Hayabusa Chest: Collect six hidden skulls.
Elite Flight Shoulders: Complete "The Ark" under the Heroic or higher difficulty.
Elite Flight Head: Complete Campaign mode under the Heroic difficulty.
Elite Flight Body: Complete "Tsavo Highway" under the Heroic or Legendary difficulty.
Elite Commando Shoulders: Earn the "Killing Frenzy" achievement.
Elite Commando Head: Earn the "Overkill" achievement.
Elite Commando Body: Earn the "Triple Kill" achievement.
Elite Ascetic Shoulders: Earn the "Overkill" achievement.
Elite Ascetic Head: Earn the "Steppin' Razor" achievement.
Elite Ascetic Body: Earn the "Up Close and Personal" achievement.
Use Anti-Air Wraith:
Requirements: Battle Rifle/Carbine and lots of patience.
All you have to do is eliminate the secondary gunner and then stand on top of the driver. Bash open the hood (melee) until you can see the driver. Then melee the Brute until the helmet is gone (or if the helmet is not on the Brute, then do not melee).
Now comes the hard part. You have to find a spot where it DOES NOT give you the option to board the enemy Wraith (Hold RB...) So for the split second that this does not show, hold RB and shoot the Brute in the head (while still holding RB). You should now board the Wraith once the Brute is dead.
If you were not holding RB while you killed the Brute, the Wraith would most likely explode.
Also, if you get out of the Wraith, it will explode, not allowing you to enter it again. (supplied by: darkish_raven)
For the Achievment: We're in for some Chop:
You will want to grab this achievment on the level: Tsavo Highway. After meeting up with the pinned Marines, and eliminating the Phantom troops, a Covenant Wraith tank will veer from cover and start attacking, (Make sure to grab a mine before engaging it). When the Wraith gets close enough, deploy the mine directly under the Wraith, sometimes if it doesn't work the first time, another mine should do the trick. Just make sure not to destroy the tank before deploying the mines, it needs to be operational, with the Brute's still inside for it too fully work. (supplied by: Agamidae)
Easy 'Too close to the sun' Acheivement:
You can get this achievement at the very beginning of the level The Covenant. Save one shot in your spartan laser. After you cleared the area, shoot one of the banshees in the sky with your laser. (supplied by: PF2K)