50 Cent: Blood On The Sand

Due to the nature of this achievement; Solution for Millionaire In 50 Cent: Blood on the Sand it's a good idea to work on this achievement after having unlocked the Millionaire achievement, you can either play through the campaign naturally a bunch of times but a much quicker way is to farm money on Mission 4: Chapter 2, I won't go into detail though, the full explanation can be seen in the solution I linked above or the video I've linked below.

You need somewhere in the region of $1.5 million for all the upgrades, which isn't much more grinding so I just got that amount and then got all the unlockable achievements in one quick go!

Once you've farmed enough, find a telephone booth, they're scattered throughout nearly every level and use it, then from there go to the shop menu and just buy all the unlockables!

* ^{Credit to xCheexbrgr for the video}

There are a total of 6 Close Combat weapons that need to be purchased to unlock this achievement. To purchase weapons you need to go to a Payphone and then click on "Shop" (which if my memory serves me right) is the "Y" button.

If you need help getting the money required to get these weapons here is an excellent guide on how to get money on the second to last level where you fight the helicopter in the mansion.

Note: If you are going to vote negatively please comment or PM me first as I am willing to adjust anything that needs to be for this to be proper.