Just had a quick look through games i've completed on TA/TT that have the same steam list (some games, like Torchlight, are way harder on Steam).
All of the games below I have completed on another platform and found easy. They all sit well below a 1.5 ratio aswell on TA/TT
PACMAN Championship Edition DX Achievements - 1 hour
MURDERED SOUL SUSPECT Achievements - 5 - 8 hours (dependant on whether you use collevtible guide)
Actual Sunlight Achievements - 1 hour
Contrast Achievements - 3-4 hours
The Testament of Sherlock Holmes Achievements - 8 - 14 hours (length of time would greatly differ depending on whether you used a guide)
The Testament to Sherlock Holmes might be a bit long considering I'm guessing the main use of this list is people wanting a few easy but also quick games to beef up their TSA profile (tried to keep most of my additions <6 hours) but it is a fun game and is very easy. The puzzles aren't hard but even if someone was struggling a guide would get them through