Sounds to me like WAR! Season. Or maybe Free-2-Play Season?
Crusader Kings 2
Elite Dangerous
Killing Floor 2
Star Wars Battlefront 2 (2017)
Star Wars The Old Republic - alternate Republic/Sith weekly
Stellaris
War Thunder
World of Tanks / Warships - alternate weekly
Receive a promotion to the rank of Commander
Unlocked Sat 26 Sep, 2020 8:36 PM
0.64% have received this achievement
Sign three roll calls in a row
Unlocked Thu 01 Mar, 2018 9:02 AM
9.72% have received this achievement
Be a registered user for five years
Unlocked Wed 10 Aug, 2022 8:01 PM
76.25% have received this achievement
RSVP to ten events via the Events System
Unlocked Sat 13 Jan, 2018 10:02 PM
1.31% have received this achievement
Going from Clearance Level 3 to Clearance Level 4
Unlocked Sat 15 Dec, 2018 1:05 AM
1.91% have received this achievement
Receive a promotion to the rank of Lieutenant Commander
Unlocked Sat 23 Mar, 2019 11:37 PM
0.92% have received this achievement
Sounds to me like WAR! Season. Or maybe Free-2-Play Season?