Slime Rancher

End Game Method: Earning this achievement is done easily in the end game if you don't have it already.
Earlier Method for those who are impatient: The easy way to earn money, and this will help for getting to the Golden Sureshot upgrade at club level 22 as you need hundreds of thousands of newbucks to get there, is to play the market. This is easiest if you have tangle slimes unlocked in the glass desert, but if you're not that far, this can be done with really any slime. Well... I wouldn't recommend Crystal Slimes or any that are primarily meat eaters as chickens can be annoying to get a hold of in mass, and odd onions can't be grown as easily. The more valuable the slime though, the quicker it will be. Start setting up corals and fill them with your selected slime, I only had five corals full of about 15 slimes a piece. Upgrade the corals as you make them with higher walls, an air net, and a plort collector for greater simplicity. For each new coral you build, create a garden with at least the first two upgrades. In this garden grow whatever your selected slimes favorite food is, the Wiki Guide for this can be found here > http://slimerancher.wikia.com/wiki/Food. Fill the rest of your spaces with fully upgraded silos which you will fill with the plorts of whatever slime you're farming. Either go do something else while checking back in occasionally to empty collectors/harvest food, or rest until morning to speed up the process. The hoarding of the plorts will drive up the price and once you feel the market price is high enough, sell all the plorts as quickly as possible. Repeat this process a few times while potentially changing the slime your farming if you feel like it and you can get money pretty quickly. You can also make your slimes largos and use the secondary plort to sell constantly throughout to afford expansions ventures if you so choose, but don't feel obligated to do that. Using this method, you should be at 100k in no time.

Here is my video guide for how to get a lot of plorts and newbucks quickly and easily:

In order to get this achievement and all other "Earn over --- newbucks" achievements, there's a simple strategy to complete this quickly and pretty passively.

1. Make two corrals with the high wall, air net, auto feeder, and plort collector upgrades.
2. Fill both corrals with 10-15 largos. Preferably late game slimes like quantum/crystal and
dervish/mosaic largos.
3. Use their favorite foods to gather twice as many plorts. All favorite foods can be found in
the slimepedia. The favorite food of either half of the largo will give twice the plorts for both
halves of the largo.
4. Harvest to your hearts content! You can complete this process quicker by sleeping until the
next morning, refilling the auto feeders, emptying the plort collectors, and going right back
to sleep!

Here's my video for every achievement if you'd prefer. Skip to 4:27 for Upper Crust.
Happy Hunting!

for this achievement collect 100,000 newbucks, this is simple as newbucks are needed to continue in the game. you get newbucks for putting plorts in the market. so just farm a whole bunch of plorts and you will get this easy. you do not need all of the newbucks at once, it is cumulative. apparently the fastest way to get newbucks is by making boom/honey largo slimes (which is feeding a boom slime a honey plort and vice versa) and feeding them mint mangos, this will drop 2 plorts each time and it will allow maximum income.