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