My Time at Sandrock

This triggered for me the morning after going into The Breach for the first time.

Progress through the story and eventually The Breach will open up. At this point you will probably start each day with at least 350 stamina. Try to go in as early as you can with a full stamina bar.

The first time you enter it will take you to a separate special instance of The Breach and freeze time. Usually it would cost you 4 hours and 200(?) stamina to enter, however this first time doesn't take it from you. I believe the game however still counts it.

After you've cleared The Breach, go and spend the rest of your 300+ stamina for the day by mining or whatever, and the achievement should hopefully pop the next morning!

Easily done at any point when you have enough stamina available, either from leveling or from carrying around lots of fruit and jerky.

Personally, I went around kicking all the cacti. They'll nearly always drop a fruit, which can be consumed to replenish two stamina points. I also had a bunch of jerky, which can be consumed to recover even more.

Hit stones / chop bushes etc until your stamina has only one or two points left, eat your fruit and jerky, then do it all again. As long as you use over 500 points then go to sleep, this will unlock the following morning..