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