The creature performed two significant kindnesses for the De Lacey family (the cottagers):
1. He secretly gathered firewood for them. The creature, observing their poverty and struggles, quietly collected wood for their fire, showing his capacity for compassion and empathy.
2. He saved the young De Lacey boy from drowning. The creature, witnessing the boy struggling in the water, bravely plunged in and pulled him to safety, demonstrating his strength and courage.
These acts highlight the creature's inherent goodness and the conflict between his physical appearance and his true nature.