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