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