My 5e D&D Achievement XP Awards System

This is my current XP system for non-combat achievements, from getting through a difficult door to a diplomatic negotiation, finding hidden treasure, or significant exploration. It is similar to the 5e DMG suggested approach, but based off monster Challenge XP and awards are divided by Tier, not by Level. It gives increasing awards at higher levels, but advancement generally slows over time.

Low Level (Tier 1) XP awards (per PC)

Easy Achievement: 10 XP (Challenge 0)
Minor Achievement: 25 XP (Challenge 1/8) 

Moderate Achievement: 50 XP (Challenge 1/4)

Major Achievement: 100 XP (Challenge 1/2)

Very Hard Achievement: 200 XP (Challenge 1)
Exceptional Achievement: 450 XP (Challenge 2)

Mid Level (Tier 2) XP awards (per PC)

Easy 50 XP (Challenge 1/4)

Minor 100 XP (Challenge 1/2)

Moderate 200 XP (Challenge 1)

Major 450 XP (Challenge 2)

Very Hard 700 XP (Challenge 3)

Exceptional 1100 XP (Challenge 4)

High Level (Tier 3) XP awards (per PC) 

Easy 200 XP (Challenge 1)

Minor 450 XP (Challenge 2)

Moderate 700 XP (Challenge 3)

Major 1100 XP (Challenge 4)

Very Hard 1800 XP (Challenge 5)

Exceptional 2300 XP (Challenge 6)

Epic Level (Tier 4) XP awards (per PC) 

Easy 700 XP (Challenge 3)

Minor 1100 XP (Challenge 4)

Moderate 1800 XP (Challenge 5)

Major 2300 XP (Challenge 6)

Very Hard 2900 XP (Challenge 7)

Exceptional 5000 XP (Challenge 8)

XP awards tend to increase over time, as the scale of achievements increase. Acquiring significant treasure is usually worth some XP, as is rescuing prisoners, infiltrating a guarded keep, exploring a cavern network, etc. A typical session award for non-combat achievements might be 25 XP per PC at level 1, rising to ca 100 XP per PC at level 4.

PC Level - Typical Non-Combat Session Award (for extensive non-combat activities)

1 - 25

2 - 50

3 - 75

4 - 100

5 - 150

6 - 200

7 - 250

8 - 300

9 - 350

10 - 400

11 - 450

12 - 500

13 - 600

14 - 700

15 - 800

16 - 1000

17 - 1500

18 - 2000

19 - 2500