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