Here is the full list of all 48 Time Survivors achievements.
Survive 20 minutes with Ned
Survive 5 minutes with Ned
Reach Level 10 with Ned
Kill 10 T-Rexes
Kill 96 Triceratops
Complete "The Dark Age" stage
Meet the Mortician
Reach 25% in the Meta progression
Reach minute 5:55 in The Ice Age stage
Complete the Egypt Age stage
Use the Red Leech for more than 600 seconds in total
Complete "The Egypt Age" stage
Kill the flying Pyramid
Recover 2000 Health Points by any means
Upgrade Plasma Gun to max level during a run
Upgrade Ice Orb to max level during a run
Kill 1000 scarabs
Reach Level 66 with Nik in any stage
Defeat 3 Cerberi in a single run
Deal a total of 500.000 damage with any fire weapon
Upgrade Slingshot to max level during a run
Walk 20 Km
Reach minute 14:40 in The Dark Age stage
Use the Tesla Coil for more than 600 seconds in total
Find 3 Magic Mushrooms
Kill 222 Evil Priests
Upgrade Telescope to maximum level
Get 5 Apples
Defeat a total of 5000 enemies
Upgrade Amoeba to max level during a run
Find 3 Giga Magnets
Meet your first huge monster dog, the Barghest
Play a run in the full "Time Survivors"
Get 300 gold
Survive 6 minutes with Claire
Kill 2023 enemies
Destroy 20 vases
50 Gold turns into 100. Buy upgrades at the Shop!
Reach Level 10 with any character
Reach Level 5 with any character
Death is the way
Deal a total of 1.000.000 damage with the Shuriken
Reach level 16 with Mulan in "The Stone Age" stage
Upgrade Shuriken to max level during a run
Survive 20 minutes as Cleo
Reach 50% in the Meta progression
Reach 75% in the Meta progression
Reach 100% in the Meta progression