Make It Rain
Purchase an item from the Armory that requires the rank of Lt. Colonel.
To reach the rank of Lt. Colonel, you must climb through the following ranks: Recruit,
Private, Corporal, Corporal Grade 1, Sergeant, Sergeant Grade 1, Sergeant Grade 2, Warrant Officer, Warrant Officer Grade 1, Warrant Officer Grade 2, Warrant Officer Grade 3, Captain, Captain Grade 1, Captain Grade 2, Captain Grade 3, Major, Major Grade 1, Major Grade 2, and Major Grade 3.
That's quite a way to go, and quite a lot of credits! With enough dedication, you'll reach the rank of Lt. Colonel. Then, just purchase an item that requires the Lt. Colonel rank (for example, Grenadier Knee Pads, the JFO Helmet or the MJOLNIR Mk. V Helmet) and this achievement is yours!
The Start Of Something
Reach the rank of Corporal in the UNSC.
Move through the Recruit and Private ranks to reach Corporal. You'll reach this rank and unlock this achievement in no time.
An Honor Serving
Reach the rank of Captain in the UNSC.
To reach the rank of Captain, you must climb through the following ranks: Recruit,
Private, Corporal, Corporal Grade 1, Sergeant, Sergeant Grade 1, Sergeant Grade 2, Warrant Officer, Warrant Officer Grade 1, Warrant Officer Grade 2, and Warrant Officer Grade 3.
Just keep at it and you'll eventually earn this rank and achievement.
A Storage Solution
Use the File Browser to upload a file to your File Share.
Upload one of your creations -- a screenshot, video, Forge design or game variant -- using the File Browser. You'll need either an Xbox Live Gold subscription or a Bungie Pro subscription to do this.
Share one of your creations and earn an achievement in the process!
A New Challenger
Complete all of the Daily Challenges in a given day.
There are four daily challenges each day. They differ in difficulty, but check in everyday and there will surely be one day where all four challenges are within your grasp.
Make It Drizzle
Purchase an item from the Armory.
Make a purchase from the Armory to nab this easy achievement.
Cool File, Bro
Recommend a file to someone.
Recommend a file to your friends through the File Browser menu to earn this achievement.
Lemme Upgrade Ya
Advance a Commendation to a Silver state.
You can see your Commendation progress by pressing the Back button when on the main menu, entering the Service Tag section and then Commendations.
To advance a Commendation to Silver, you first must move through the Iron and Bronze states. Keep playing and you'll eventually meet this requirement.
One Down, 51 To Go
Complete a Weekly Challenge.
You'll earn this achievement upon completing your first weekly challenge. All of the weekly challenges at the time of this writing have been quite easy (albeit some require quite a bit of dedication). Check back each week and there's sure to be a weekly challenge that's within your grasp.