World of Tanks

The last of the three Light tank games played achievements, this is the longest and I would highly recommend trying out as many different light tanks as you can to get a good taste of variety and see if you want to work through any other tank trees.
This achievement itself is quite easy, just time-consuming. All Tier 1 tanks are light tanks, and a lot of Tier 2 tanks are Light tanks as well! Light tanks have a solid diamond by their Tier number.
Just start a game with your light tank, if you get destroyed you can just go straight to your garage and pick another ready light tank and play another match!

This achievement is pretty easy. It just takes a while to play the 100 games. It doesn't matter if you win or lose.

You can unlock a Light Tank at tier 1 on every nation tech tree. A Light Tank has a symbol of a Diamond.

You can check your progress by going onto the stats page while in the garage for each Light Tank you play. Or since you're on the Xbox one version you can check the percentage on the achievement when you snap.

This doesn't have to be done all in one Light Tank.