With the 3rd phase of the PTS you can earn the last of the special achievements and titles that will be granted to your characters when 6.0 arrives on the live servers. There are two stages of rewards with the second just becoming available with phase 3:
Complete 10 Flashpoints, Uprisings, Starfighter, Warzones or Operations with the Activity Finder during phase 3 of the public test of SWTOR Onslaught.
We're going to focus on the Flashpoints and Uprisings since those are quick to do, don't rely to much on group/gear composition and can be handled with small groups.
Be Prepared! Please make sure you have downloaded the latest PTS and copied one or more characters to the server before the event start time. You can see a good guide for doing both here, it even has pictures 😁