If you’re an Achievement freak and want to have them all, you probably always wanted this one but the extremely high costs stopped you from buying/crafting one?
There is a solution for this, which will cost you nothing! There are a few exploits, which allow you to get the Achievement for free without having to build/buy an Mekgineer's Chopper/Mechano-hog for yourself!
How does it work?
It’s very easy and there are two ways to get this achievement for free!
Notice: This only works with the current 3.0.3/3.0.8 patch! It will be fixed with 3.1, so use it as long as you can before 3.1 Ulduar Patch goes live!
Being Engineer
If you’re an Engineer all you have to do is to build this baby for someone else. Best it would be to yell in Dalaran or Trade channel, that you’re crafting Mekgineer's Chopper/Mechano-hog for free (or that you will give the Cobalt Bolts for free if someone order an Mekgineer's Chopper/Mechano-hog from you)! And then simply craft it.
You will get the achievement for the crafting. Now you can give the Mekgineer's Chopper/Mechano-hog to the buyer and he can get the Achievement too.
For non-engineers
Get a friend or guild mate craft one Mekgineer's Chopper/Mechano-hog. But before he learn it, he should mail it to you. Once you pick it up from your mail box, you will receive the achievement. DON’T LEARN THE MOUNT NOW! You can send it across all your alts/twinks until every one has it and do the same with your friends etc.