Check the Astroneer wiki for the detailed list. Each Engine rewards one suit, paint pallette, and a few of them give a new visor color, so you don't have to unlock all of them, just the ones that give you the suits you want. To unlock other suits, you have to activate the Gateway Engines at the cores of planets. The author of this thread has indicated that this post answers the original topic.

The author of this topic has marked a post as the answer to their question. Home Discussions Workshop Market Broadcasts. Let me know if anything else happens and I'll try and help. If all else fails, simply save, exit, and reload the game. You can check the resource requirements by finding the icon on the pillars in the Astropedia. I just spent hours doing all this on the terran world, got the achievement, but no suit or palette unlock If you haven't, unlock the core. Though I unlocked all the surface ones before checking, so you may only need the surface and core. The core is blocked by a forcefield but if you unlock one 'big purple' on the surface, the forcefield should lift, allowing you access to the central core. You have to unlock the core of a planet to unlock the suits for each. I thought that the suits would be unlocked by traveling to new planets but it seems it isnt like that. I just traveled to the moon, exotic and its satellite and I still havent unlocked any new suits.

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