This is really easy if you take your time with it. Just put your game on Child's Play and go to Shopping Maul Parking Lot. Collect all the parts for Larry and bring them back to him. Then when he asks you do destroy the ferris wheel. Do it but don't destroy it completely. Just take it down to its last bar. Now the enemies will spawn forever and give you tons of coins for every enemy, even the big ones. Just keep killing until you get 9,999 tokens. Once you do completely destroy the ferris wheel and finish the level. Then go onto another character and pick any level and collect 1 coin and the achievement will unlock after you finish the level you collect the 1 coin on. Don't worry about your health becasue you lose health very very very slowly. You won't even be at half-way when you reach 9,999 tokens. You can also work twords getting your 10,000 kill achievement and your 1,000 kilometer achievement while doing this.