My Orbiter addon checklist:
Chang'e 4 Lander, Yutu 2 Rover, Queqiao and Longjiangs - (Partially complete)
Chandrayaan 2, Vikram and Pragyan - (addon development ongoing)
Mars 2 & 3 landers and Prop-M rovers - (In early stages of development)
Phobos 1 & 2 (and Landers) - (In early stages of development)
Mars 2020 rover and Mars Helicopter Scout - (Addon development ongoing)
Chang'e 4 Lander, Yutu 2 Rover, Queqiao and Longjiangs - (Partially complete)
Chandrayaan 2, Vikram and Pragyan - (addon development ongoing)
Mars 2 & 3 landers and Prop-M rovers - (In early stages of development)
Phobos 1 & 2 (and Landers) - (In early stages of development)
Mars 2020 rover and Mars Helicopter Scout - (Addon development ongoing)