Whelp my guide for TrueAchievements site is coming along swimmingly and is more than 90% finished but I wanted to see if anyone has more info on a few achievements (mostly your 'best guess' on where we should try to unlock them).
Unknown:
Mystery Achievement - Inscrutable. Mysterious. - clueless, but maybe that youtube vid at the bottom will have the proper easter egg to unlock this, if that's what triggers it.
Halo: CE
My Buddy Chips - Halo CE: Fight alongside Chips Dubbo and listen to his words of wisdom.
---- I've gotten a few inputs on this, but it's still a guessing game. Anyone think they have this one pinned down?
Halo 2 Anniversary
Six Pedals, Four Directions - Halo 2: Drive a Scorpion while playing as the Arbiter.
---- This one's probably super obvious, but I haven't gotten around to putting my OG Halo 2 disc in to see if I can pin it down.
Betcha can't stick it... - Halo 2: Stick a Plasma Grenade to a Stealth Elite on Outskirts.
---- Same as above, most likely a super easy one, but not 100% as I can't recall invisible Elites on that level. It's been too long.
THE Chips Dubbo? - Halo 2: Fight alongside the legendary Chips Dubbo and listen to his words.
---- Chips is going to give me nightmares. I have a couple inputs on his location(s) in Halo 2 but...
10 Minutes Too Early - Halo 2: In The Oracle, find the holo-drone before the Heretic Leader activates it.
---- I think someone mentioned how to do this earlier in this thread. I'll try to go back and find it.
E E E - Halo 2: View both signs in the level Metropolis.
---- I'm clueless here.
Halo 3
Missing Link - Halo 3: Watching. Waiting. Plotting.
---- I already found the monkey family for the one achievement, and the lone monkey 'outside the map' for the 2nd one, but this 3rd missing link achievement has me stumped.
Can't Keep Him Down - Halo 3: Fight alongside and listen to The Man. The Legend. Chips Dubbo.
---- Damnit chips....
Heading to his Destiny - Halo 3: Destined for greatness.
---- Completely at a loss, although I have a couple ideas (see youtube vids below)
Sounds Familiar - Halo 3: This stuff is your history!
---- Same as above
Halo 4
You're No Chips - Halo 4: What do Marines know about sticks?
---- I'm gonna feel silly if these Chips Dubbo achievements wind up being almost impossible to miss with IWHBYD turned on or something.
These are the only 11 achievements across all 4 titles that I'm not 100% certain I either have nailed down or at least know the method for (looking at you, Halo 2 Megg achievement).
Now here's a few things I think MIGHT apply to a couple of those Halo 3 easter egg achievements that I haven't nailed down...
Possible video for easter egg achievements:
https://www.youtube.com/watch?v=gwDG0-2vMqY
Jason Jones in his boxers?? Start vid at 7:26.
A grunt in a barrel on multiplayer map?? Possible achievement egg? Start vid at 2:11.
Start the above video at 8:45 to show the elephant flip. Might be one of the easter egg achievements? (Hold to flip
wait, what? How did you do that?)
Another potential easter egg for an achievement, the Red vs Blue egg. Guy banging on door in Crows Nest (different dialogue on different difficulties).
https://www.youtube.com/watch?v=waL8K2SGR1M