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