Here is the full list of all 101 Little hidden city achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
pass_level_country house
find light
find potty
find plant_in_roof
find log
find watering can
find tools
find Boots
find stairs
find watering can_2
find bucket of apples
pass_level_apartment
the end of the game
find TV
find basketball
find camera
find traffic light
find inflatable pool
find statue
find pointer
find cat
find wheelchair
find flower_palicious
find solar_battery
find VOLGA
find water_motocycle
find telescope
find air conditioning
find slide
find football_ball
find bicycle
find electric car
find satellite_talk
find power station
find swing
find boat_old
find motorcycle
find medical bed
find tractor
find gazebo
find sculpture_rock
complete a level gas station
find part of the train
find barrel
find engine
find canister_2
find muffler
find hovel
find extinguisher
find strut
find wheel_2
find soona
find haystack
find logs
find canister
find equipment for garage
find Jack
find old car
find army trailer
find wheel
find spare part
pass_level_supermarket
find pac_products
find bank_register
find fish
find handbag_female
find shoe
find soft toy
find jacket
find eggplants
find steak_sibs
find basket
find cake_shocolate
find watermelon
find bucket_washing brush
find stool
find carton
find bananas
find trolley
find moped
find sink
find drawer
pass_level_busstation
find bottles
find newspaper
find nameplate
find suitcase_02
find stroller
find shoes
find bicycle_old
find suitcase_opened
start the game
find tube
find strap
find suitcase
find bag
find umbrella
find hat
find magnifying_glass
find book
find coat