The lowest hanging fruit so to speak are creating a good company and/or doing great work as an employee of a good company, serving as a judge at competitions/events (or as a reviewer for conferences or journals), obtaining membership in professional associations that require outstanding achievement of its members, and being the subject of media attention.

How would one go about demonstrating "great work as an employee"? Also would that be enough for an eb1?

Definitely not enough for an EB1 in and of itself. You would need a letter from the confirming and describing your responsibilities and achievements.