We must reach Year 10. To advance to the next year, you need to press "End Year". As long as you last 10 years, You will unlock this achievement.
The easiest way to beat the game is to select the "Greeks". As you are able to hire a minotaur from the beginning of the game. With a Minotaur or 2, it's pretty hard to lose any battles.
Besides that, my #1 TIP is to
FOCUS ON HIRING PEASANTS. As you earn 100 coins per year with EACH Peasant! (Ex. 30 Peasants = 3,000 Coins per year)
ACHIEVEMENT BREAKDOWN:Completion Time - 25-30 Minutes for 2000g
Summary - You must complete the game at least once to get all of the achievements. As there is an achievement for Reaching Year 50 (The end of the game). Besides that, you just need to make sure to get 2 Upgrades in each of the upgrade categories. 5 upgrade/belief categories. (10 Total). With that being said, you can only get 7 upgrades per playthrough. *Will require another half of a playthrough*
VIDEO GUIDE: