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Date & Time: 3:10AM CST
Frequency: Once
World name: Hyperion
Character name: Saa'li Detria
Class/Level: Botanist 69; Botanist 70; Miner 69; Miner 70
Party or solo: Solo
Steps:
1. Leveled up from 69 to 70 on Miner
2. The achievement "Fear the Reaper VII" was earned.
3. Afterwards, leveled up from 69 to 70 on Botanist.
4. The achievement "Breaking Rocks in the Hot Sun VII" was earned.

I have attached a screenshot showing botanist leveling up and earning the miner achievement - while i have a screenshot of the opposite occurring, due to being on Miner at the time, the text is unclear.