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