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i dont know eactly but go on youtube and check Tasselfoots channel, he has got all the acheivements in achievement unlocked
Press the keys 1,2,3,4 and it will change the color of the elefant
You beat the game by feeding the king hamster-thing 600 pellets, though after this you can go on to do the rest of the achievements.
The Security Head and only be unlocked by getting a gamerscore of at least 1000 in Halo 3 with at least 49 achievements from Halo 3 unlocked. Before Title Update 2 this meant you had to unlock all the achievements to unlock the Security Head. Since the new achievements from Title Update 2, the head may be unlocked from any 49 non-vidmaster achievements.
How do you get the achievement 49 on Achievement Unlocked
1 hello again: use the internet 2 playtastic: you found the play button 3 crossroads: discovered the main menu 4 5 6 7 8 9 10
You press 'p' to pause the game and press it again to unpause.
Jumping off a building screaming "Y O L O"
In game 3, the safe spots are in the pit.
Some helmets on halo 3 require you to get to a certain rank on online multiplayer, some require you to complete the campaign on certain difficulties (including legendary, but you can do this on solo or co-op), some require certain achievements and others require you to collect all the skulls. I would know as I have obtained all, hope that helps, look on Youtube for more info or guides. Also I will list the helmets for both Spartans and elites and give info on how to get them. Spartans: Mark VI (already unlocked), Mark V (get UNSC spartan achievement), ODST (get spartan graduate achievement), CQB (already unlocked), Hayabusa (collect all skulls in campaign), EVA (complete campaign on normal or higher), Security (obtain 1000G on Halo 3), Recon (complete all vidmaster achievements), Rogue (get spartan officer achievement), Scout (get used car salesman achievement), EOD (complete campaign on legendary) Elites: Commando (get overkill achievement), Aesthetic (get steppin razor achievement), Flight (complete campaign on Heroic or higher), Assault (already unlocked) , Combat (already unlocked)
easy 1, 2, 3, 4, 5, 6, 7 ...... ACHIEVEMENT UNLOCKED
If you Prestiege, that's one secret achievement.