Humanity

After collecting 50 Goldys, you'll unlock the Monolith skin for your people. Just unlocking this skin pops the achievement. There are 150 Goldys to find throughout the game with many levels having multiple to collect. You'll need to lead your people to the Goldy to collect them and then deliver them to the goal block with the rest of your people using commands.

Here is a full video walkthrough with all solutions, all Goldys, and achievements! (Timestamps in YouTube Description)