World of Tanks

Tier 7 is going to take a long time! You're looking at at least 100,000+ XP required in most cases, often much more. I have some recommendations on tanks I found fun for Tier 7. I personally haven't gotten too many Tier 7 tanks and none of the newer French, Chinese, and Japanese nations yet, but I did find some really nice Tier 7's of the ones I did get!

German Tier 7's as a rule are beasts on the battlefield. They have great armor and firepower but are generally quite slow. The Tiger, Panther, Aufkl. Panther, VK 30.02 D, JPanther... I enjoyed the ones of those I was able to get, and when I saw them on the enemy team I was worried.
British Tier 7's very a lot. The Comet is fast and has good hitting power, the AT 7 feels underpowered for the Tier, the Black Prince is supposedly the best Tier 7 when upgraded.. of those, I think I liked the Black Prince the most.
US Tier 7's in general I found a lot of fun--they have a good balance of armor, hitting power, and speed. I really enjoyed the T20, T25/2, T25 AT, and T29.
Soviet Tier 7's I only tried out one, but it was decent. I never really enjoyed it though. I got the Tier 7 IS. It had good power, but I found it a bit slow for my style. If you like slower powerful armored tanks though, it's a good choice!

For efficiency in earning all achievements in the game, this achievement should be stacked with



Which requires you to research a Tier 7 tank already. You should then continue on this same path to unlock



Because you are already at Tier 7, and no other nation specific achievements require you to go higher than 6, meaning this will be the most time efficient having already had to grind to 7.