This achievement requires you to complete any job in GTA Online whilst you are a member of a crew AND playing with another member of that same crew in the job with you. You can be on different teams and do not need to win.
To join a crew you will need to visit the Rockstar Social Club's Crew section
. You will firstly need a social club account so go ahead and sign up if you havnt already, otherwise log in with your account.
Pick a crew that either the friends who you already play with are in OR pick a crew that you both will need to join. Once joined load up GTA Online and look for a job and invite your other crew member into. Once the job is complete your achievement will be unlocked so long as you both have the same active crew set.Note: If you change your crew status whilst you are actively in GTA Online you will be kicked out and have to pick your GTA Online character again to apply the changes.