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