Never Gamble With a Telepath.

See Enough... Is Never Enough first for selling crystal.

Here you need to buy 100k - if you're just grinding out the achievement this is easiest done after selling it. You'll lose cash (as obviously you'll sell for less than you have to buy for), but that's no great loss.

NB it is not yet clear whether this has to be in a single match - but mid-late game in any medium or larger match you'll likely have more than enough cash left to grind this out in a single match.

This is soft-missable as in late-game if the factions you can trade with have been destroyed then you're no longer able to trade and get this.