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