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