Microsoft Rewards - up to 10000 rewards points for every achievement earned.

Some easy game pass games to get 10000 gamerscore

The Gardens Inbetween
Fractured Minds
What remains of Edith Finch
Full Throttle Remastered
The Touryst
HellBlade - Senuas sacrifice
Tracks
Subnautica
Wandersong
Pixark (Download Free trial and use Maka91's guide on YouTube)
Sea of Solitude
pikuniku
Any Telltale Walking Dead Game
The Turing Test
Surviving Mars
Ark Survival Evolved
Peggle 1 & 2
Tell me why

Rocket League (Free)

Life is Strange (Free)

Some games are available on the xcloud so no need to wait for big downloads.