My (then) 7 year old accidentally started Minecraft on my login and popped a few achievements. It was his game and I'd never had interest in the game but being the completionist with achievements I jumped in. Now we enjoy mining together and I just wrapped up my 1000GS :) it's a fun calm game for all ages.
This is an easy game for achievements. The key is to have your Kinect setup in a high position and tuned. Boost your stats in level 1 & 2 (10 speed, 7 Stamina, and 3-4 for Dive, Turn and Finish).
It took a week to complete Farming Simulator 15, it had the exact same achievements as FS 2013 and additional ones too. Finding the 100 coins and getting a bonus from the well afterwards helps get a financial push from the beginning. From there you can afford some better equipment for farming. I ended up with the 13 million after the week I played, a lot coming...