Here is the full list of all 19 Modest Kind achievements.
Solve 108 Quiz Trivia Questions
Defeat Hoarding Dragon on Museum Floor
Ambush Jacco Macacco on Glasshouse Floor
Overcome your Shadow Self on Residential Floor
Learn the truth
Collect all Artifacts
Clear 1000 Infants
Collect 200 silver coins
Get out of Birth Keep in 2 minutes or less
Discuss all subjects with Geofront dwellers
Collect 50% of all Artifacts
Complete a floor without losing health
Defeat 100 Qliphoths
Solve 108 Quiz Trivia Questions without collecting Artifacts
Read 70% dweller stories in Geofront
Do not talk to anybody and clear 1000 Infants
Resolve 100 encounters
Solve 300 Quiz Trivia Questions
Get out of Birth Keep