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Megabonk Achievements

Official Steam achievement definitions and latest reported global unlock rates, ordered from rarest to most common.

Total achievements139
Rarest rate0.900%
Ultra rare2
Last checkedOct 17, 2026
Delayed official data

Rates and award counts were last observed on Oct 17, 2026.

21
Top Hat

Get 100,000 kills on Forest in a single run

Very rare
4.20%last reported global rate
22
Cactus

Kill 100 cactus enemies with Thorns damage

Very rare
4.30%last reported global rate
23
Snek

Discover in the secret room in the crypt on Graveyard

Very rare
4.40%last reported global rate
24
Roberto

Kill Spooky Steve

Very rare
4.50%last reported global rate
25
Bob's Light

Kill Big Bob on Graveyard using damage from charging a lamp as the finishing blow

Very rare
4.60%last reported global rate
26
Shady Hat (black)

Buy 100 items from a Common Shady Guy

Rare
5.40%last reported global rate
27
Pot (stainless steel)

Open every chest and pot in the first crypt on Graveyard

Rare
6.40%last reported global rate
28
Challenges2

Complete 10 Challenges

Rare
7.00%last reported global rate
29
Quin's Mask

Defeat a Stage Boss as Athena, landing the killing blow with Aegis

Rare
8.40%last reported global rate
30
Old Mask

Find on Graveyard

Rare
8.60%last reported global rate
31
Eagle Claw

Kill 10 000 enemies as Birdo

Rare
8.90%last reported global rate
32
Scythe

Kill Big Bob on Graveyard

Rare
10.6%last reported global rate
33
Red Frog

Find the frogs on Forest Stage 3

Rare
10.7%last reported global rate
34
Chaos Tome

Charge every Charge Shrine on a Tier 3 run across all 3 stages without leaving the charge zone

Rare
14.5%last reported global rate
35
Kevin

Obtain 3 Leeching Crystal in a run

Rare
14.6%last reported global rate
36
Corrupted Sword

Get Cursed Tome to Level 20 in under 10 minutes

Rare
15.1%last reported global rate
37
Blue Frog

Find the frogs on Forest Stage 2

Rare
15.6%last reported global rate
38
Shattered Knowledge

Upgrade Attraction Tome to Level 8

Rare
15.9%last reported global rate
39
Hero Sword

Defeat a Stage Boss without picking up any items, powerups or using shrines.

Rare
16.8%last reported global rate
40
Birdo

Kill 100 enemies using the Tornado weapon while carried by a tornado on Desert

Rare
17.7%last reported global rate