- How I Unlocked It -
Level 1 (Camp Map)
Walk To The Bus Stop Seating Area, Next To The Sign And Wait 10-15 Seconds.
- Then, Line Your Guy Up With The Bus Stop Pole-Sign.
Wait Another 10-15 Seconds.
- Then I Unlocked The Bike From The Bus Stop Sign.
- Only Thing That Happened To Confirm That I Had Done It Was The Sound Of The Achievement Through Steam.
Achievement Popped.
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Tips And Thoughts
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The Bus Stop Was Not Encompassed By My Camp, And Still Had Some Trees Around It.
I Bought The Bike On My First Playthrough (On Hard), But Achievement Did Not Unlock, I Thought Maybe It Was Glitchy.
- Unlocking The Bike's Not Required. (Confirmed By Zangdaarr)
Did Waiting Matter?
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Summary
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So, Either The 10 Seconds I Waited There Mattered, Leaving The Trees Up Around It Was Important, And/Or Unlocking The Bike Mount Might Do It; It Might Just Be Kind Of Buggy.
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Lastly
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After Reading Somewhere "I Saw Bus Stops On Other Maps, Maybe You Can Do It On Map Two" (Paraphrased)
- Waiting At The Bus Stop On Map 2 And 4 For Two Straight Days And Nights, No Matter How Many Times You Try - Does Not Unlock It. (Confirmed By Deathtroth)
Good Luck!