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