This can is unlocked for obtaining Titan Insignias. This is done by completing tasks and challenges (you will usually unlock most of these naturally). Additionally, you can also purchase a few from the black market. Just go for other achievements and you should easily have 30-40.
Note: When I got the 50th Insignia, the achievement did not unlock until I completed another game. When I did that, the achievement unlocked at the end of the match.