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