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