Second Tier = Upload 5 Replays on Youtube
(Note: Due to user replies/comments have stated that this achievement no longer unlocks, so this might be discontinued/unobtainable)
In order to upload replays, you must have a Youtube account, and must authorize it in order to do so, before you do, you must...
-Go to Settings under Help and Options, and then select "Authorize Youtube Account"
-Then go here to https://www.google.com/device
and sign in with your YT acct.
-After that, you'll have to enter a unique code, once entered, you'll be able to upload matches to Youtube on your YT account.
-And then go to Multiplayer > Replays > My Replays > Select any saved video (These must be your own matches saved, not others) > Upload to Youtube.
Note: If the option to upload is greyed out, you might have to enable Social Network Sharing under Settings > Customize > Privacy from the Dashboard. (Credit to StylishKillah.)