Transformers: Revenge of the Fallen

This is actually a pretty easy, although time consuming achievement. during your missions you will acquire energon. Somply save your energon and during the war room screens between missions you can pull either trigger to find new tabs. You will find one tab showing your upgrades. Simply move your cursor over an upgrade and hold "A" to fill the upgrade meter. When it is filled you have fully purchased it and will reap the rewards. Purchase all of these and you will earn the achievement.

The best method for this achievement is to work on it throughout the campaign and just keep building toward it while you try and earn Platinum on every mission, however you may find you still need this achievement after doing that or you might find you're struggling to earn Platinum on a few levels, if that's the case then you should head over to; Cairo Pyramids - Defeat The Fallen.

Once you've gotten used to the level and what you need to do to finish it you should be able to finish this level in about 3 minutes, which not only will net you the Platinum medal for this level but for defeating The Fallen you'll net yourself 200,000 Energon which is what is used as currency in this game.

To purchase upgrades you need to use the LT/RT buttons to switch through the menus while in the Decepticon campaign, it's not hard to find, in fact after completing a mission it normally automatically takes you to that menu screen!

Using this method you'll rack up Energon in no time and unlock this achievement with ease, now while I don't know the exact amount needed to unlock all the upgrades I estimate it to be around the 2.6 million mark, after unlocking this achievement I unlocked Solution for Break the Bank In Transformers: Revenge of the Fallen within 2 more games!

I've linked in a video of someone playing/completing the last mission (named above), if you find yourself stuck on it or confused about what to do, use it as a reference!

* ^{Credit to yanceygrc54 for the video}