Snow Storm - 40G (Requires Title Update 48)
Difficulty: Easy
Estimated Period of Time: Short
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To get this Achievement use 2 Controllers by signing your second controller in as a Guest, or else you'll have to get lucky against actual players. This MUST be down in a Public game, so make sure you ready up your controllers with the X Button once you arrive in the hub world to start immediately and avoid randoms.
While using a 2nd Controller, as soon as the match starts, run up to your 2nd Controller and press the Left Trigger to throw a snowball at them. Hit them with 25 Snowballs to get this Achievement. You may want to maneuver around them so they don't fall down into the lava.
(Also at the time I'm writing this Achievements are NOT being synced with the site yet, so don't panic if it isn't showing yet)
IMPORTANT NOTE: Thanks to LordFightALot a solution has been found for anyone that was trapped with relocked Achievements on the day of Title Update 48's release! Do as follows and there is a 99% of it working!
"This is exactly what I did:
1. Start up the Xbox (it auto signed in for me)
2. Manually sign out of your profile on the Xbox dashboard.
3. Launch Minecraft.
4. Press Play Game
5. A popup appears and asks you to sign in. Press Yes [I want to sign in].
6. The achievements popped right away on the world selection screen."
If this worked for you, don't thank me, go thank LordFightALot!