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HOLOCRON – Get Hooded Costume
WOOKIEE – Get Father’s Costume
MANDALORE – Unlock Kota
If you beat the game on Legendary mode, you will get a special, extended ending. Keep in mind that you only have to beat the final stage on Legendary mode, and not necessarily the rest of the game, in order to unlock this ending.
Unlockable: Elite Armor Permutations
Unlock the following Elite armor permutations by fulfilling the requirement listed…
The arms of the player and the motion tracker disappear.
Cowbell (Located: The Ark)
Your explosives increase in strength.
Grunt Birthday Party (Located: Crow’s Nest)
If you manage to get a headshot on a Grunt, the Grunt will explode.
I Would Have Been Your Daddy (Located: The Covenant)
Unlocks new dialogue for the campaign.
When activated, you will have to battle enemies with melee tactics to regain shield energy.
Catch (Located: The Storm)
When activated, enemies will throw more grenades.
Famine (Located: The Ark)
When activated, dropped weapons will hold less ammunition.
Fog (Located: Floodgate)
When activated, the motion tracker disappears.
Iron (Located: Sierra 117)
When activated, you will be sent back to the beginning of the stage you’re on when you die instead of to the last checkpoint.
Mythic (Located: Halo)
When activated, all enemies will have twice as much health.
Thunderstorm (Located: The Covenant)
When activated, enemies will be of a higher rank.
Tilt (Located: Cortana)
When activated, enemies will become more resilient to your attacks.
Tough Luck (Located: Tsavo Highway)
When activated, enemies are skilled at getting away from projectiles such as grenades.
To unlock the Katana, which is a non-usable item that is essentially the fourth piece of Hayabusa Armor, get all thirteen Skulls in the game, and achieve a gamerscore of 1,000 (complete all achievements).
Terminals: The Ark
Go left through a door once in the very first building of the stage. The terminal is located beyond a curving passage.
A terminal is located right near the device that activates the bridge on this stage.
There’s a secret room in the third building which holds the third and final terminal on The Ark. After you come across and kill a group of sleeping Covenant enemies, head down the nearby corridor. You’ll reach a door that is locked if you do. To the left of the locked door is an open door. Head through the door, and then turn around to find the terminal.
Terminals: The Covenant
Head to the stage’s first tower and stand on the elevator. Face the control panel, and then turn left. Jump over the obstacle, and find the terminal you seek.
Head to the stage’s second tower and walk towards the entrance. When you come across a locked door, turn around to find the second of three terminals here.
Head to the stage’s third tower and stand on the elevator. Face the control panel, and then turn right. Jump over the obstacle, and find the third and final terminal on the stage.
Traverse the first cave, and then head right until you come across a building. Walk along the passageway towards the building. Once inside, run left to find the terminal.
Locate the spot on the Scarab’s rear armor that is below its rotating anti-air “ass” (or abdomen) turret. A few shots from Hornet missiles or Scorpion tank shells and the armor will fall off and reveal the critical system you normally need to board to wreck. Don’t forget that shooting the Scarab’s legs will stop it from turning.
Custom power-ups can only be used in Custom Games. Press BLUE to edit the match options in a Custom Game. Go into Weapons and Vehicles, then locate the Custom Power-up Traits. Have fun!
Easter Egg: Elephant Flipper
In the Forge, edit the Sandtrap map and create a Scorpion. You can use the tank to lift and flip the Elephant (the large Sandcrawler vehicle). Once the Elephant is upside down (or undrivable), approach it to flip the vehicle and get a humorous message.
Relentless Offense – 20 points.
Win Hydro without giving up a capture.
Revenge! – 10 points.
Destroy the hunter-chopper in Half-Life 2.
Rocket Science – 20 points.
Earn silver medals on all Portal challenges.
Secondary Silo Secured – 5 points.
Secure the launch doors on missile silo 2.
Submission – 5 points.
Put the trash in the garbage can in HL2.
Targetted Advertising – 5 points.
Pin a soldier to the billboard in chapter Highway 17.
Team Doctor– 5 points.
Accumulate 25000 heal points as a Medic.
Terminal Velocity – 5 points.
Fall 30,000 feet.
The One Free Bullet – 40 points.
Beat Episode One firing exactly one bullet. Grenade, crowbar, rocket, and Gravgun kills are okay!
Think Fast! – 10 points.
Kill an Elite Soldier with his own energy ball.
Trusty Hardware – 5 points.
Get the crowbar.
Turret – 5 points.
Accumulate 10 turret kills with a single turret.
Two Points – 2 points.
Use DOG’s ball to make a basket in Eli’s scrapyard.
Twofer– 5 points.
Defeat both antlion guards outside the White Forest
Vanilla Crazy Cake – 30 points.
Beat all six Portal advanced maps.
Vorticough – 13 points.
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Warden Freeman – 10 points.
Survive the second turret standoff in Nova Prospekt.
Watch Your Head! – 5 points.
Make it to the bottom of the Citadel’s main elevator shaft in one piece.
What cat? – 5 points.
Break the mini-teleporter in Kleiner’s lab.
Where Cubbage Fears to Tread – 5 points.
Defend Little Odessa from the Gunship Attack
With Friends Like these… – 10 points.
Play in a game with seven or more players from your friends list.
World Traveler – 5 points.
Play a complete game on every map.
Zero-Point Energy – 5 points.
Get the Gravity Gun in Black Mesa East.
Zombie Chopper – 25 points.
Play through Ravenholm using only the Gravity Gun.
Zombie-que – 5 points.
Use flares to light 15 zombies on fire.