Here is the full list of all 27 Save Your Nuts achievements.
Unlock the Beaver
Unlock the Wolf
Win at least once on all maps
Win a match against a team of hard bots
Win an online match
Play a match with at least 4 players
Dig up the giant power up
Win a match during overtime
100 punch in one match
Steal more than 5 nuts in a single Thieves match
Win a battle without losing any balloons
Score 5 goals in Capture The Nut
Finish the tutorial in less than 30s
Win a Capture The Nut match in less than 1 min
Win a hard match alone against 4 bots in BACKYARD
Win a hard match alone against 4 bots in PARK
Win a hard match alone against 4 bots in TRAIN STATION
Win a hard match alone against 4 bots in SPACE STATION
Win a hard match alone against 4 bots in ICE LAKE
Win a hard match alone against 4 bots in DUNGUEON
Win a hard match alone against 4 bots in WATERFALLS
Win a hard match alone against 4 bots in PIRATE SHIP
Save a nut with a Jetpack
Get 3 poop traps in a single match
Knock at least 2 opponents with a single bomb
Cumulate the power of a coffee, a donut and a hotdog