Alto's Adventure

NOTE: Despite the developers patching this achievement to reduce the grind from 10 years to 5 years, they only succeeded in changing the description. The achievement won't unlock until you reach 10 years played (3,650 days).

One in-game day takes 7 minutes and 30 seconds to elapse in real life. This means you're looking at over 300 hours of play time to unlock all of these achievements. Thankfully there is a way to idle your game and have time elapse without actually needing to be actively playing for all those hours:

After crashing, you will be given the option to either Resume your run or end it. To Resume, you'll be forced to watch a short advertisement. After this ends, your snowboarder will be sitting on the ground and you'll have to tap to resume playing. Instead of tapping to resume, you can sit there and let time pass indefinitely; however, you must, at some point, resume playing and then crash and end the run officially for the time to count, so make sure you do that before quitting out if you leave it sit idle.

There will be times when you aren't given the option to resume if there are no ads available. Unfortunately you'll just have to wait until more are available to resume using this workaround.

Theoretically this achievement should be done last, since you'll be spending a very large portion of time collecting 100,000 llamas, but if you want to knock this achievement out while you have time to idle, go for it.