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