Century: Age of Ashes

As the description states, you got to reach Level 50 to unlock this achievement.

Looking at the ratio here makes getting this achievement sound way more daunting that it really is. Reality is thanks to the daily and weekly challenges, you can easily get this achievement in about 10-15 hours of playtime depending on your skill.

To reach level 50 you need in total 2,500,000XP. Easiest way to get this amount of XP is thanks to the weekly quests.
For me there were 12 sets of 7 weekly challenges/quests (84 in total) I could complete in one go, each quest of which gave me 20,000XP.
For every 3 weekly challenges/quests you complete, you also recieve an extra 30,000XP. So in total for completing all challenges in a week you'll be looking at around needing to do 80 weekly challenges/quests and you'll have enough to reach Level 50. However, you'll also be gaining quite a bit of XP just for playing the game and even finishing daily quests. So by the time you've completed 60-70 quests, you should have enough XP to have reached Level 50.

All in all, it took me 10 hours to reach Level 50, and about 67 weekly quests.