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