Deity Achievement in 10 Minutes

• Enable “Single Player Auto End Turn” and "Single Player Quick Combat" and "Single Player Quick Movement" in the game options
  

1. Start a SINGLE PLAYER

2. From the SCENARIOS list, choose: "The Samurai Invasion of Korea"

3. Select the Korean civilization — ruler Sejong

4. Set the difficulty to Deity (but you can choose any difficulty to unlock it)

5. Launch the scenario

6. Do almost* nothing for 100 turns — just keep ending turns automatically

After about 100 turns, the game will end in Defeat. Despite losing, the "Flawless Strategy" achievement for a Deity Victory will unlock. Additionally, you’ll also receive the scenario-specific achievements.

This bug seems to occur because China is your ally in this scenario. After 100 turns, if China's cities haven’t been completely captured, the game mistakenly treats it as a victory — awarding both the scenario completion and the Deity achievement. Essentially, it’s a case of developer oversight.