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