This list is for anyone who wants to know the order of each piece of media. The different Predator and Alien Versus Predator (AVP) media are not canon within the Alien/ Aliens timeline as they are part of their own canon each. Please note the statements of 20th Century Fox consultant Andrew E.C. Gaska on his website https://roguereviewer.wordpress.com/2020/10/12/defining-canon-in-an-alien-world/. This list is the best so far for continuity.
Billions of years ago - one Engineer sacrifices himself to seed Earth with the building blocks of life.
1st century AD - Engineers prepare a death ship to destroy their wayward children, humanity.
1990 AD - Sir Peter Weyland is born.
2008 AD - European Space Marine Corps established.
2024 AD - Yutani Corp sues Weyland over patent of the android model “David.”
2026 AD - Weyland acquires Genentech and privatizes NASA’s Kepler mission, within the year discovering 4,326 bio-compatible planets.
2029 AD - Weyland wins David patent lawsuit against Yutani Corp.
2034 AD - The advent of Faster Than Light Travel.
2064 AD - Elizabeth Shaw’s memory of her father.
2065 AD - Sir Peter Weyland Memorial Library is built in Washington, DC.
2066 AD - Sieg and Son has manufacturing plants in London, Nagasaki, Buenos Aires, and the lunar Schickard-Wargentin Frontier.
2071 AD - The Sieg family sells all its shares back into the company.
2079 AD - Events of Happy Birthday, David.
2089 AD - Peter Weyland dictates a letter reminiscing about his mentor Eldon Tyrell and their competition in the field of artificial intelligence. He is later reported to have died in a station above Mars.
2089 AD - Events of Quiet Eye.
2091 AD - Events of Prometheus Transmission.
2092 AD - Ellen Ripley is born on January 7.
2093 AD - Major occurrences in the Prometheus Expedition.
2094 AD - Events of Alien: Covenant - The Crossing.
2103 AD - Events of Alien: Covenant - Origins and Alien: Covenant - Phobos.
2104 AD - Events of Alien: Covenant - The Last Supper.
2104 AD - Happenings from Alien: Covenant .
2104 AD - Events of Alien: Covenant - Advent.
2120 AD - The Nostromo leaves Earth.
2122 AD - Happenings from Alien.
2124 AD - Sevastopol Station is completed.
2127 AD - Michael Weyland is born.
2137 AD - Happenings from Alien: Isolation aboard the Sevastopol Space Station.
2138 AD - Happenings of Aliens: Defiance.
2140 AD - Happenings of Aliens: Resistance.
2159 AD - Happenings of Alien: Out of the Shadows.
2179 AD - Ripley is rescued from the Outer Rim.
2179 AD - Ripley is taken to Gateway Station.
2179 AD - Alien: River of Pain.
2179 AD - Alien: The Cold Forge.
2179 AD - Happenings from Alien 3.
2194 AD - Michael Weyland dies.
2295 AD - Events of Aliens: Dead Orbit.
2381 AD - Major happenings from Alien: Resurrection.
2497 AD - Events of Alien: Sea of Sorrows.
*For comparison, most events in the Starship Troopers franchise are set in the 2300s AD.