Game Room

For 3 fairly easy golds, even if you are kind of a mediocre arcader like myself, buy Crystal Castles and start a ranked game.
*** edit *** They only need to be bronze medals, but all 3 golds are easy on this games so that is why I picked this game.

~On first screen go to the back of the play area in the corner and you will find a secret jump spot. Press A to jump here and you will immediately get your gold medal out of the way ;)
~ The hardest part is Surviving 6 minutes. For this you need to start a new your game, wait til all 3 enemies have come around the corner, then run around to the jump spot and sit there. When the hornets come down about the 5th time they will try to land on you. Run around in a big circle til they get you.Do this 3 times and on the last time use your jump point. Go to the left elevator and go up and wait. Do this again for your extra life and you should just manage 6 minutes.
~ Now just repeat the above til you have 3 shiny golds ;)

This achievement requires paid content.

You need to earn at least one of each style of medal to unlock this achievement. There are three medal varieties:
Point Buster : These medals are awarded when you reach certain score targets.
Survivalist : These medals are awarded for surviving a set amount of time in a single play.
Time Spender : These medals are awarded for cumulative game play.

It is alright if you do not unlock them all in the same game, although chances are if you are playing a game that has all three available that you will have at least bronze Survivalist and Point Buster before you earn Time Spender.

For this achievement you need to get at least a Bronze in each medal type (Point Buster, Survivalist, Time Spender). Personally I found Shao-Lin's Road to be the easiest game to get these on as you can survive and rack up a lot of points on this game easily. After you get those two just rack up an hour's worth of playtime for the Time Spender medal and you should get this in no time.

For this achievement play PITFALL, it's easy to do the 3 medals in this game.

Grab the first gold bullion = the point busters medal is yours.

For the survivalist and the time spender medals = go in a safe area and just stay here, move sometimes but don't go in an other area.

The 3 medals can be done in 1 session.

the only difficulty of this game is pass the crocodile, just jump on their head, you must be on their eyes when he opens his mouth to keep you from falling.

With this method you can also unlock the 3 medal achievement.

all you need for this is one single play of Thunder Castle.

avoid the dragon (you can kill it--don't do that if you can help it but the yellow isn't hard to avoid either the bats make you invincible and allow you to kill the dragon so just remember that if you collect a bat) and collect all items except the comb (do not pick up the comb!).

25k/30min surv/90 min TS for the 3 gold medals. If you just want 3 medals the bronzes are 5k/10/30.