Here is the full list of all 52 Alchemy Classic achievements.
create elements: 25
invent: Sandglass
create elements: 10
create: Fog, Rain, Snow, Thunderstorm, Wind
create: Bacteria
create: Reptiles
create: Mammals
create: Flowers
create: Shrub
create: Flowers, Shrub, Trees, Forest
invent: Compass
invent: Wheel
complete: 100% Machines
construct: Potter's wheel
construct: Incomplete building
construct: Steam turbine, Steam engine, Steam boat
produce: Textile
invent: Sail
discover: Sound
create: Agricultural land
create: Domestic animals
discover: Minerals
invent: Musical instruments
create: Observatory, Astrolabe, Star chart
construct: Exhibit
create elements: 50
invent: Internal combustion engine
construct: Ornithopter, Sailplane, Airplane
produce: Caoutchouc, Rubber
construct: Nuclear power station, Atom battery, Atomic submarine
discover: Polluted Earth
construct: Automated factory
create: Wind Turbine, Water Turbine, Solar power plant
construct: UFO
construct: Active robot
create: Alien, Robot, UFO, Freezer
create: Octopus, Dolphins, Whales
create: Origami
create: Dinosaurs, Flying Dinosaurs, Plesiosaurs
create: Dark chocolate, Milk chocolate
complete: 100% Chemical substances
construct: Cloud castle
invent: Scuba
construct: Incomplete mechanism
create elements: 100
create elements: 200
create elements: 300
create elements: 400
Create All Elements
create Borehole
construct: Forge
create: Amphibians