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