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