In Title Update 31, released on Dec 18, 2015 there is an armour stand in the tutorial world with a full set of iron armour on it. You will now be able to get this achievement in less than 45 seconds.
The stand is located on the upper floor (up the ladder) behind an iron door at location: x. 35 z. 68 y. -23 (note the minus).
If you don't have a pickaxe you could save a bit of time breaking the door down by digging 3 blocks of dirt from the side of the house and building a dirt tower up to the glass windows above the door, then break through the glass.
Just knock the stand over, take the armour, and put it on.