Here is the full list of all 21 21 Days achievements.
listen what happened to Kareem’s family
survive for 10 days
take a rest in Central Park
work as a server at Restaurant Sylvia
visit Shell gas station
understand all conversation
visit Restaurant Sylvia
eat Halal food
talk to Mahdi
pile up Bricks at Factory
do carpentry at Factory
work as a cashier at Restaurant Sylvia
do gas pumping at Shell Gas station
work as a cashier at Shell Gas station
get the ticket from Lucas
console the elderly man
do volunteer work ar Refugee School
visit Back Street
talk to everyone at least once
meet the ending of the game
work more for family who arrived here