Introduction
First, I want to describe what this guide is not.  I have not included any of the grid zone coordinates for any of the "Tourist" or "Dead Reckoner" achievement telescopes because they are all inside of very clearly marked-on-the-maps towns and take little effort to track down.

Everything listed below is a Wayfinder or Orienteer achievement with the odd UrbExer or Boss waypoint thrown in.  Y'know, the hard ones.

1. Unless marked otherwise all achievements are telescopes.
2. All locations are to the telescopes themselves.

Sector 1

• Dish Field: 5018099   4320270
• Geaumont Farm: 4903207    4005538
• Highway Bridge: 4204117   3321880
• Jensen Farm: 4414263   3863268
• Murderhole: 5033926   4193932
• Murphy: 4585693   3741283
• (UrbExer) NORSEC MIssile Silo: 4653421   3939600
• (Boss) Project 432: 4071989   3776599
• Rawson Farm: 4516471   4142386
• Salvager Fortress: 4087189   3053933

Sector 2

• Bug Farm: 5043758   5629673
• Camp Purity: 4523728   5456151
• Gamburian Encampment: 5121774   5265156
• (Boss) Geiger: 4041185   4953620
• Greenburgh: 5081415   5505144
• Hackberry Mine: 4450842   4984176
• Havasu Pond: 5176007   5183709
• (UrbExer) New Flagstaff University: 4107179   5380036
• Pumphouse: 5033144   5779854
• Sunset Farm: 4287405   5155347
• Zeigler Farm: 4293598   5490746

Sector 3

• Banker's Relic Museum: 6151521  5982815
• Bonefield: 6698462 4702996
• Displacer Compound 6151616   5152216
• Gamburian Encampment: 6527259   5401062
• Raven's Roost: 6639181   5380802
• Saint Bethias Chapel: 6999102   4622327

• achievement
• explorer
• orienteer
• wayfinder